Use strongly-typed types.NodeName for a node name

api/swagger-spec/v1.json

@@ -16549,7 +16549,7 @@
      },
      "host": {
       "type": "string",
-      "description": "Host name on which the event is generated."
+      "description": "Node name on which the event is generated."
      }
     }
    },

cmd/kubeadm/app/node/csr.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"os"
 
+	"github.com/golang/glog"
 	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/api"
 	kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
 	"k8s.io/kubernetes/pkg/apis/certificates"
@@ -29,6 +30,7 @@ import (
 	"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
 	clientcmdapi "k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
 	"k8s.io/kubernetes/pkg/kubelet/util/csr"
+	"k8s.io/kubernetes/pkg/types"
 	certutil "k8s.io/kubernetes/pkg/util/cert"
 )
 
@@ -37,11 +39,16 @@ func PerformTLSBootstrap(s *kubeadmapi.KubeadmConfig, apiEndpoint string, caCert
 	// TODO(phase1+) try all the api servers until we find one that works
 	bareClientConfig := kubeadmutil.CreateBasicClientConfig("kubernetes", apiEndpoint, caCert)
 
-	nodeName, err := os.Hostname()
+	hostName, err := os.Hostname()
 	if err != nil {
 		return nil, fmt.Errorf("<node/csr> failed to get node hostname [%v]", err)
 	}
 
+	// TODO: hostname == nodename doesn't hold on all clouds (AWS).
+	// But we don't have a cloudprovider, so we're stuck.
+	glog.Errorf("assuming that hostname is the same as NodeName")
+	nodeName := types.NodeName(hostName)
+
 	bootstrapClientConfig, err := clientcmd.NewDefaultClientConfig(
 		*kubeadmutil.MakeClientConfigWithToken(
 			bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName), s.Secrets.BearerToken,

cmd/kubelet/app/bootstrap.go

@@ -30,6 +30,7 @@ import (
 	"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
 	clientcmdapi "k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
 	"k8s.io/kubernetes/pkg/kubelet/util/csr"
+	"k8s.io/kubernetes/pkg/types"
 	certutil "k8s.io/kubernetes/pkg/util/cert"
 )
 
@@ -42,7 +43,7 @@ const (
 // The kubeconfig at bootstrapPath is used to request a client certificate from the API server.
 // On success, a kubeconfig file referencing the generated key and obtained certificate is written to kubeconfigPath.
 // The certificate and key file are stored in certDir.
-func bootstrapClientCert(kubeconfigPath string, bootstrapPath string, certDir string, nodeName string) error {
+func bootstrapClientCert(kubeconfigPath string, bootstrapPath string, certDir string, nodeName types.NodeName) error {
 	// Short-circuit if the kubeconfig file already exists.
 	// TODO: inspect the kubeconfig, ensure a rest client can be built from it, verify client cert expiration, etc.
 	_, err := os.Stat(kubeconfigPath)

cmd/kubelet/app/server.go

@@ -61,6 +61,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/server"
 	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
 	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/types"
 	certutil "k8s.io/kubernetes/pkg/util/cert"
 	utilconfig "k8s.io/kubernetes/pkg/util/config"
 	"k8s.io/kubernetes/pkg/util/configz"
@@ -169,7 +170,7 @@ func getRemoteKubeletConfig(s *options.KubeletServer, kubeDeps *kubelet.KubeletD
 	}
 
 	configmap, err := func() (*api.ConfigMap, error) {
-		var nodename string
+		var nodename types.NodeName
 		hostname := nodeutil.GetHostname(s.HostnameOverride)
 
 		if kubeDeps != nil && kubeDeps.Cloud != nil {
@@ -460,9 +461,9 @@ func run(s *options.KubeletServer, kubeDeps *kubelet.KubeletDeps) (err error) {
 
 // getNodeName returns the node name according to the cloud provider
 // if cloud provider is specified. Otherwise, returns the hostname of the node.
-func getNodeName(cloud cloudprovider.Interface, hostname string) (string, error) {
+func getNodeName(cloud cloudprovider.Interface, hostname string) (types.NodeName, error) {
 	if cloud == nil {
-		return hostname, nil
+		return types.NodeName(hostname), nil
 	}
 
 	instances, ok := cloud.Instances()
@@ -607,7 +608,7 @@ func RunKubelet(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *kubelet
 	}
 
 	eventBroadcaster := record.NewBroadcaster()
-	kubeDeps.Recorder = eventBroadcaster.NewRecorder(api.EventSource{Component: "kubelet", Host: nodeName})
+	kubeDeps.Recorder = eventBroadcaster.NewRecorder(api.EventSource{Component: "kubelet", Host: string(nodeName)})
 	eventBroadcaster.StartLogging(glog.V(3).Infof)
 	if kubeDeps.EventClient != nil {
 		glog.V(4).Infof("Sending events to api server.")

contrib/mesos/pkg/executor/service/service.go

@@ -44,6 +44,7 @@ import (
 	kconfig "k8s.io/kubernetes/pkg/kubelet/config"
 	"k8s.io/kubernetes/pkg/kubelet/dockertools"
 	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 // TODO(jdef): passing the value of envContainerID to all docker containers instantiated

docs/api-reference/v1/definitions.html

@@ -5008,7 +5008,7 @@ The resulting set of endpoints can be viewed as:<br>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">host</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">Host name on which the event is generated.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Node name on which the event is generated.</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
 <td class="tableblock halign-left valign-top"></td>

pkg/api/types.go

@@ -2568,7 +2568,7 @@ type SerializedReference struct {
 type EventSource struct {
 	// Component from which the event is generated.
 	Component string `json:"component,omitempty"`
-	// Host name on which the event is generated.
+	// Node name on which the event is generated.
 	Host string `json:"host,omitempty"`
 }
 

pkg/api/v1/generated.proto

@@ -769,7 +769,7 @@ message EventSource {
   // Component from which the event is generated.
   optional string component = 1;
 
-  // Host name on which the event is generated.
+  // Node name on which the event is generated.
   optional string host = 2;
 }
 

pkg/api/v1/types.go

@@ -3017,7 +3017,7 @@ type SerializedReference struct {
 type EventSource struct {
 	// Component from which the event is generated.
 	Component string `json:"component,omitempty" protobuf:"bytes,1,opt,name=component"`
-	// Host name on which the event is generated.
+	// Node name on which the event is generated.
 	Host string `json:"host,omitempty" protobuf:"bytes,2,opt,name=host"`
 }
 

pkg/api/v1/types_swagger_doc_generated.go

@@ -477,7 +477,7 @@ func (EventList) SwaggerDoc() map[string]string {
 var map_EventSource = map[string]string{
 	"":          "EventSource contains information for an event.",
 	"component": "Component from which the event is generated.",
-	"host":      "Host name on which the event is generated.",
+	"host":      "Node name on which the event is generated.",
 }
 
 func (EventSource) SwaggerDoc() map[string]string {

pkg/cloudprovider/cloud.go

@@ -22,6 +22,7 @@ import (
 	"strings"
 
 	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 // Interface is an abstract, pluggable interface for cloud providers.
@@ -63,7 +64,7 @@ func GetLoadBalancerName(service *api.Service) string {
 	return ret
 }
 
-func GetInstanceProviderID(cloud Interface, nodeName string) (string, error) {
+func GetInstanceProviderID(cloud Interface, nodeName types.NodeName) (string, error) {
 	instances, ok := cloud.Instances()
 	if !ok {
 		return "", fmt.Errorf("failed to get instances from cloud provider")
@@ -86,11 +87,11 @@ type LoadBalancer interface {
 	// EnsureLoadBalancer creates a new load balancer 'name', or updates the existing one. Returns the status of the balancer
 	// Implementations must treat the *api.Service parameter as read-only and not modify it.
 	// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager
-	EnsureLoadBalancer(clusterName string, service *api.Service, hosts []string) (*api.LoadBalancerStatus, error)
+	EnsureLoadBalancer(clusterName string, service *api.Service, nodeNames []string) (*api.LoadBalancerStatus, error)
 	// UpdateLoadBalancer updates hosts under the specified load balancer.
 	// Implementations must treat the *api.Service parameter as read-only and not modify it.
 	// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager
-	UpdateLoadBalancer(clusterName string, service *api.Service, hosts []string) error
+	UpdateLoadBalancer(clusterName string, service *api.Service, nodeNames []string) error
 	// EnsureLoadBalancerDeleted deletes the specified load balancer if it
 	// exists, returning nil if the load balancer specified either didn't exist or
 	// was successfully deleted.
@@ -108,22 +109,22 @@ type Instances interface {
 	// TODO(roberthbailey): This currently is only used in such a way that it
 	// returns the address of the calling instance. We should do a rename to
 	// make this clearer.
-	NodeAddresses(name string) ([]api.NodeAddress, error)
-	// ExternalID returns the cloud provider ID of the specified instance (deprecated).
+	NodeAddresses(name types.NodeName) ([]api.NodeAddress, error)
+	// ExternalID returns the cloud provider ID of the node with the specified NodeName.
 	// Note that if the instance does not exist or is no longer running, we must return ("", cloudprovider.InstanceNotFound)
-	ExternalID(name string) (string, error)
-	// InstanceID returns the cloud provider ID of the specified instance.
-	InstanceID(name string) (string, error)
+	ExternalID(nodeName types.NodeName) (string, error)
+	// InstanceID returns the cloud provider ID of the node with the specified NodeName.
+	InstanceID(nodeName types.NodeName) (string, error)
 	// InstanceType returns the type of the specified instance.
-	InstanceType(name string) (string, error)
+	InstanceType(name types.NodeName) (string, error)
 	// List lists instances that match 'filter' which is a regular expression which must match the entire instance name (fqdn)
-	List(filter string) ([]string, error)
+	List(filter string) ([]types.NodeName, error)
 	// AddSSHKeyToAllInstances adds an SSH public key as a legal identity for all instances
 	// expected format for the key is standard ssh-keygen format: <protocol> <blob>
 	AddSSHKeyToAllInstances(user string, keyData []byte) error
 	// CurrentNodeName returns the name of the node we are currently running on
 	// On most clouds (e.g. GCE) this is the hostname, so we provide the hostname
-	CurrentNodeName(hostname string) (string, error)
+	CurrentNodeName(hostname string) (types.NodeName, error)
 }
 
 // Route is a representation of an advanced routing rule.
@@ -131,9 +132,8 @@ type Route struct {
 	// Name is the name of the routing rule in the cloud-provider.
 	// It will be ignored in a Create (although nameHint may influence it)
 	Name string
-	// TargetInstance is the name of the instance as specified in routing rules
-	// for the cloud-provider (in gce: the Instance Name).
-	TargetInstance string
+	// TargetNode is the NodeName of the target instance.
+	TargetNode types.NodeName
 	// DestinationCIDR is the CIDR format IP range that this routing rule
 	// applies to.
 	DestinationCIDR string

pkg/cloudprovider/providers/aws/aws_routes.go

@@ -86,9 +86,9 @@ func (c *Cloud) ListRoutes(clusterName string) ([]*cloudprovider.Route, error) {
 			glog.Warningf("unable to find instance ID %s in the list of instances being routed to", instanceID)
 			continue
 		}
-		instanceName := orEmpty(instance.PrivateDnsName)
+		nodeName := mapInstanceToNodeName(instance)
 		routeName := clusterName + "-" + destinationCIDR
-		routes = append(routes, &cloudprovider.Route{Name: routeName, TargetInstance: instanceName, DestinationCIDR: destinationCIDR})
+		routes = append(routes, &cloudprovider.Route{Name: routeName, TargetNode: nodeName, DestinationCIDR: destinationCIDR})
 	}
 
 	return routes, nil
@@ -110,7 +110,7 @@ func (c *Cloud) configureInstanceSourceDestCheck(instanceID string, sourceDestCh
 // CreateRoute implements Routes.CreateRoute
 // Create the described route
 func (c *Cloud) CreateRoute(clusterName string, nameHint string, route *cloudprovider.Route) error {
-	instance, err := c.getInstanceByNodeName(route.TargetInstance)
+	instance, err := c.getInstanceByNodeName(route.TargetNode)
 	if err != nil {
 		return err
 	}

pkg/cloudprovider/providers/aws/aws_test.go

@@ -34,6 +34,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 const TestClusterId = "clusterid.test"
@@ -605,11 +606,11 @@ func TestList(t *testing.T) {
 
 	table := []struct {
 		input  string
-		expect []string
+		expect []types.NodeName
 	}{
-		{"blahonga", []string{}},
-		{"quux", []string{"instance3.ec2.internal"}},
-		{"a", []string{"instance1.ec2.internal", "instance2.ec2.internal"}},
+		{"blahonga", []types.NodeName{}},
+		{"quux", []types.NodeName{"instance3.ec2.internal"}},
+		{"a", []types.NodeName{"instance1.ec2.internal", "instance2.ec2.internal"}},
 	}
 
 	for _, item := range table {
@@ -705,7 +706,7 @@ func TestNodeAddresses(t *testing.T) {
 	fakeServices.selfInstance.PublicIpAddress = aws.String("2.3.4.5")
 	fakeServices.selfInstance.PrivateIpAddress = aws.String("192.168.0.2")
 
-	addrs4, err4 := aws4.NodeAddresses(*instance0.PrivateDnsName)
+	addrs4, err4 := aws4.NodeAddresses(mapInstanceToNodeName(&instance0))
 	if err4 != nil {
 		t.Errorf("unexpected error: %v", err4)
 	}
@@ -1062,7 +1063,7 @@ func TestIpPermissionExistsHandlesMultipleGroupIdsWithUserIds(t *testing.T) {
 func TestFindInstanceByNodeNameExcludesTerminatedInstances(t *testing.T) {
 	awsServices := NewFakeAWSServices()
 
-	nodeName := "my-dns.internal"
+	nodeName := types.NodeName("my-dns.internal")
 
 	var tag ec2.Tag
 	tag.Key = aws.String(TagNameKubernetesCluster)
@@ -1071,13 +1072,13 @@ func TestFindInstanceByNodeNameExcludesTerminatedInstances(t *testing.T) {
 
 	var runningInstance ec2.Instance
 	runningInstance.InstanceId = aws.String("i-running")
-	runningInstance.PrivateDnsName = aws.String(nodeName)
+	runningInstance.PrivateDnsName = aws.String(string(nodeName))
 	runningInstance.State = &ec2.InstanceState{Code: aws.Int64(16), Name: aws.String("running")}
 	runningInstance.Tags = tags
 
 	var terminatedInstance ec2.Instance
 	terminatedInstance.InstanceId = aws.String("i-terminated")
-	terminatedInstance.PrivateDnsName = aws.String(nodeName)
+	terminatedInstance.PrivateDnsName = aws.String(string(nodeName))
 	terminatedInstance.State = &ec2.InstanceState{Code: aws.Int64(48), Name: aws.String("terminated")}
 	terminatedInstance.Tags = tags
 

pkg/cloudprovider/providers/azure/azure_instances.go

@@ -24,10 +24,11 @@ import (
 	"k8s.io/kubernetes/pkg/cloudprovider"
 
 	"github.com/Azure/azure-sdk-for-go/arm/compute"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 // NodeAddresses returns the addresses of the specified instance.
-func (az *Cloud) NodeAddresses(name string) ([]api.NodeAddress, error) {
+func (az *Cloud) NodeAddresses(name types.NodeName) ([]api.NodeAddress, error) {
 	ip, err := az.getIPForMachine(name)
 	if err != nil {
 		return nil, err
@@ -35,18 +36,18 @@ func (az *Cloud) NodeAddresses(name string) ([]api.NodeAddress, error) {
 
 	return []api.NodeAddress{
 		{Type: api.NodeInternalIP, Address: ip},
-		{Type: api.NodeHostName, Address: name},
+		{Type: api.NodeHostName, Address: string(name)},
 	}, nil
 }
 
 // ExternalID returns the cloud provider ID of the specified instance (deprecated).
-func (az *Cloud) ExternalID(name string) (string, error) {
+func (az *Cloud) ExternalID(name types.NodeName) (string, error) {
 	return az.InstanceID(name)
 }
 
 // InstanceID returns the cloud provider ID of the specified instance.
 // Note that if the instance does not exist or is no longer running, we must return ("", cloudprovider.InstanceNotFound)
-func (az *Cloud) InstanceID(name string) (string, error) {
+func (az *Cloud) InstanceID(name types.NodeName) (string, error) {
 	machine, exists, err := az.getVirtualMachine(name)
 	if err != nil {
 		return "", err
@@ -60,7 +61,7 @@ func (az *Cloud) InstanceID(name string) (string, error) {
 // Note that if the instance does not exist or is no longer running, we must return ("", cloudprovider.InstanceNotFound)
 // (Implementer Note): This is used by kubelet. Kubelet will label the node. Real log from kubelet:
 //       Adding node label from cloud provider: beta.kubernetes.io/instance-type=[value]
-func (az *Cloud) InstanceType(name string) (string, error) {
+func (az *Cloud) InstanceType(name types.NodeName) (string, error) {
 	machine, exists, err := az.getVirtualMachine(name)
 	if err != nil {
 		return "", err
@@ -71,7 +72,7 @@ func (az *Cloud) InstanceType(name string) (string, error) {
 }
 
 // List lists instances that match 'filter' which is a regular expression which must match the entire instance name (fqdn)
-func (az *Cloud) List(filter string) ([]string, error) {
+func (az *Cloud) List(filter string) ([]types.NodeName, error) {
 	allNodes, err := az.listAllNodesInResourceGroup()
 	if err != nil {
 		return nil, err
@@ -82,9 +83,9 @@ func (az *Cloud) List(filter string) ([]string, error) {
 		return nil, err
 	}
 
-	nodeNames := make([]string, len(filteredNodes))
+	nodeNames := make([]types.NodeName, len(filteredNodes))
 	for i, v := range filteredNodes {
-		nodeNames[i] = *v.Name
+		nodeNames[i] = types.NodeName(*v.Name)
 	}
 
 	return nodeNames, nil
@@ -98,8 +99,8 @@ func (az *Cloud) AddSSHKeyToAllInstances(user string, keyData []byte) error {
 
 // CurrentNodeName returns the name of the node we are currently running on
 // On most clouds (e.g. GCE) this is the hostname, so we provide the hostname
-func (az *Cloud) CurrentNodeName(hostname string) (string, error) {
-	return hostname, nil
+func (az *Cloud) CurrentNodeName(hostname string) (types.NodeName, error) {
+	return types.NodeName(hostname), nil
 }
 
 func (az *Cloud) listAllNodesInResourceGroup() ([]compute.VirtualMachine, error) {
@@ -144,3 +145,15 @@ func filterNodes(nodes []compute.VirtualMachine, filter string) ([]compute.Virtu
 
 	return filteredNodes, nil
 }
+
+// mapNodeNameToVMName maps a k8s NodeName to an Azure VM Name
+// This is a simple string cast.
+func mapNodeNameToVMName(nodeName types.NodeName) string {
+	return string(nodeName)
+}
+
+// mapVMNameToNodeName maps an Azure VM Name to a k8s NodeName
+// This is a simple string cast.
+func mapVMNameToNodeName(vmName string) types.NodeName {
+	return types.NodeName(vmName)
+}

pkg/cloudprovider/providers/azure/azure_loadbalancer.go

@@ -27,6 +27,7 @@ import (
 	"github.com/Azure/azure-sdk-for-go/arm/network"
 	"github.com/Azure/go-autorest/autorest/to"
 	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 // GetLoadBalancer returns whether the specified load balancer exists, and
@@ -60,7 +61,7 @@ func (az *Cloud) GetLoadBalancer(clusterName string, service *api.Service) (stat
 }
 
 // EnsureLoadBalancer creates a new load balancer 'name', or updates the existing one. Returns the status of the balancer
-func (az *Cloud) EnsureLoadBalancer(clusterName string, service *api.Service, hosts []string) (*api.LoadBalancerStatus, error) {
+func (az *Cloud) EnsureLoadBalancer(clusterName string, service *api.Service, nodeNames []string) (*api.LoadBalancerStatus, error) {
 	lbName := getLoadBalancerName(clusterName)
 	pipName := getPublicIPName(clusterName, service)
 	serviceName := getServiceName(service)
@@ -99,7 +100,7 @@ func (az *Cloud) EnsureLoadBalancer(clusterName string, service *api.Service, ho
 		}
 	}
 
-	lb, lbNeedsUpdate, err := az.reconcileLoadBalancer(lb, pip, clusterName, service, hosts)
+	lb, lbNeedsUpdate, err := az.reconcileLoadBalancer(lb, pip, clusterName, service, nodeNames)
 	if err != nil {
 		return nil, err
 	}
@@ -114,11 +115,11 @@ func (az *Cloud) EnsureLoadBalancer(clusterName string, service *api.Service, ho
 	// Add the machines to the backend pool if they're not already
 	lbBackendName := getBackendPoolName(clusterName)
 	lbBackendPoolID := az.getBackendPoolID(lbName, lbBackendName)
-	hostUpdates := make([]func() error, len(hosts))
-	for i, host := range hosts {
-		localHost := host
+	hostUpdates := make([]func() error, len(nodeNames))
+	for i, nodeName := range nodeNames {
+		localNodeName := nodeName
 		f := func() error {
-			err := az.ensureHostInPool(serviceName, localHost, lbBackendPoolID)
+			err := az.ensureHostInPool(serviceName, types.NodeName(localNodeName), lbBackendPoolID)
 			if err != nil {
 				return fmt.Errorf("ensure(%s): lb(%s) - failed to ensure host in pool: %q", serviceName, lbName, err)
 			}
@@ -139,8 +140,8 @@ func (az *Cloud) EnsureLoadBalancer(clusterName string, service *api.Service, ho
 }
 
 // UpdateLoadBalancer updates hosts under the specified load balancer.
-func (az *Cloud) UpdateLoadBalancer(clusterName string, service *api.Service, hosts []string) error {
-	_, err := az.EnsureLoadBalancer(clusterName, service, hosts)
+func (az *Cloud) UpdateLoadBalancer(clusterName string, service *api.Service, nodeNames []string) error {
+	_, err := az.EnsureLoadBalancer(clusterName, service, nodeNames)
 	return err
 }
 
@@ -257,7 +258,7 @@ func (az *Cloud) ensurePublicIPDeleted(serviceName, pipName string) error {
 // This ensures load balancer exists and the frontend ip config is setup.
 // This also reconciles the Service's Ports  with the LoadBalancer config.
 // This entails adding rules/probes for expected Ports and removing stale rules/ports.
-func (az *Cloud) reconcileLoadBalancer(lb network.LoadBalancer, pip *network.PublicIPAddress, clusterName string, service *api.Service, hosts []string) (network.LoadBalancer, bool, error) {
+func (az *Cloud) reconcileLoadBalancer(lb network.LoadBalancer, pip *network.PublicIPAddress, clusterName string, service *api.Service, nodeNames []string) (network.LoadBalancer, bool, error) {
 	lbName := getLoadBalancerName(clusterName)
 	serviceName := getServiceName(service)
 	lbFrontendIPConfigName := getFrontendIPConfigName(service)
@@ -556,8 +557,9 @@ func findSecurityRule(rules []network.SecurityRule, rule network.SecurityRule) b
 
 // This ensures the given VM's Primary NIC's Primary IP Configuration is
 // participating in the specified LoadBalancer Backend Pool.
-func (az *Cloud) ensureHostInPool(serviceName, machineName string, backendPoolID string) error {
-	machine, err := az.VirtualMachinesClient.Get(az.ResourceGroup, machineName, "")
+func (az *Cloud) ensureHostInPool(serviceName string, nodeName types.NodeName, backendPoolID string) error {
+	vmName := mapNodeNameToVMName(nodeName)
+	machine, err := az.VirtualMachinesClient.Get(az.ResourceGroup, vmName, "")
 	if err != nil {
 		return err
 	}

pkg/cloudprovider/providers/azure/azure_routes.go

@@ -24,6 +24,7 @@ import (
 	"github.com/Azure/azure-sdk-for-go/arm/network"
 	"github.com/Azure/go-autorest/autorest/to"
 	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 // ListRoutes lists all managed routes that belong to the specified clusterName
@@ -41,13 +42,13 @@ func (az *Cloud) ListRoutes(clusterName string) (routes []*cloudprovider.Route,
 	if routeTable.Properties.Routes != nil {
 		kubeRoutes = make([]*cloudprovider.Route, len(*routeTable.Properties.Routes))
 		for i, route := range *routeTable.Properties.Routes {
-			instance := getInstanceName(*route.Name)
+			instance := mapRouteNameToNodeName(*route.Name)
 			cidr := *route.Properties.AddressPrefix
 			glog.V(10).Infof("list: * instance=%q, cidr=%q", instance, cidr)
 
 			kubeRoutes[i] = &cloudprovider.Route{
 				Name:            *route.Name,
-				TargetInstance:  instance,
+				TargetNode:      instance,
 				DestinationCIDR: cidr,
 			}
 		}
@@ -61,7 +62,7 @@ func (az *Cloud) ListRoutes(clusterName string) (routes []*cloudprovider.Route,
 // route.Name will be ignored, although the cloud-provider may use nameHint
 // to create a more user-meaningful name.
 func (az *Cloud) CreateRoute(clusterName string, nameHint string, kubeRoute *cloudprovider.Route) error {
-	glog.V(2).Infof("create: creating route. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetInstance, kubeRoute.DestinationCIDR)
+	glog.V(2).Infof("create: creating route. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetNode, kubeRoute.DestinationCIDR)
 
 	routeTable, existsRouteTable, err := az.getRouteTable()
 	if err != nil {
@@ -107,12 +108,12 @@ func (az *Cloud) CreateRoute(clusterName string, nameHint string, kubeRoute *clo
 		}
 	}
 
-	targetIP, err := az.getIPForMachine(kubeRoute.TargetInstance)
+	targetIP, err := az.getIPForMachine(kubeRoute.TargetNode)
 	if err != nil {
 		return err
 	}
 
-	routeName := getRouteName(kubeRoute.TargetInstance)
+	routeName := mapNodeNameToRouteName(kubeRoute.TargetNode)
 	route := network.Route{
 		Name: to.StringPtr(routeName),
 		Properties: &network.RoutePropertiesFormat{
@@ -122,40 +123,40 @@ func (az *Cloud) CreateRoute(clusterName string, nameHint string, kubeRoute *clo
 		},
 	}
 
-	glog.V(3).Infof("create: creating route: instance=%q cidr=%q", kubeRoute.TargetInstance, kubeRoute.DestinationCIDR)
+	glog.V(3).Infof("create: creating route: instance=%q cidr=%q", kubeRoute.TargetNode, kubeRoute.DestinationCIDR)
 	_, err = az.RoutesClient.CreateOrUpdate(az.ResourceGroup, az.RouteTableName, *route.Name, route, nil)
 	if err != nil {
 		return err
 	}
 
-	glog.V(2).Infof("create: route created. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetInstance, kubeRoute.DestinationCIDR)
+	glog.V(2).Infof("create: route created. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetNode, kubeRoute.DestinationCIDR)
 	return nil
 }
 
 // DeleteRoute deletes the specified managed route
 // Route should be as returned by ListRoutes
 func (az *Cloud) DeleteRoute(clusterName string, kubeRoute *cloudprovider.Route) error {
-	glog.V(2).Infof("delete: deleting route. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetInstance, kubeRoute.DestinationCIDR)
+	glog.V(2).Infof("delete: deleting route. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetNode, kubeRoute.DestinationCIDR)
 
-	routeName := getRouteName(kubeRoute.TargetInstance)
+	routeName := mapNodeNameToRouteName(kubeRoute.TargetNode)
 	_, err := az.RoutesClient.Delete(az.ResourceGroup, az.RouteTableName, routeName, nil)
 	if err != nil {
 		return err
 	}
 
-	glog.V(2).Infof("delete: route deleted. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetInstance, kubeRoute.DestinationCIDR)
+	glog.V(2).Infof("delete: route deleted. clusterName=%q instance=%q cidr=%q", clusterName, kubeRoute.TargetNode, kubeRoute.DestinationCIDR)
 	return nil
 }
 
-// This must be kept in sync with getInstanceName.
+// This must be kept in sync with mapRouteNameToNodeName.
 // These two functions enable stashing the instance name in the route
 // and then retrieving it later when listing. This is needed because
 // Azure does not let you put tags/descriptions on the Route itself.
-func getRouteName(instanceName string) string {
-	return fmt.Sprintf("%s", instanceName)
+func mapNodeNameToRouteName(nodeName types.NodeName) string {
+	return fmt.Sprintf("%s", nodeName)
 }
 
-// Used with getRouteName. See comment on getRouteName.
-func getInstanceName(routeName string) string {
-	return fmt.Sprintf("%s", routeName)
+// Used with mapNodeNameToRouteName. See comment on mapNodeNameToRouteName.
+func mapRouteNameToNodeName(routeName string) types.NodeName {
+	return types.NodeName(fmt.Sprintf("%s", routeName))
 }

pkg/cloudprovider/providers/azure/azure_storage.go

@@ -23,6 +23,7 @@ import (
 	"github.com/Azure/azure-sdk-for-go/arm/compute"
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 const (
@@ -31,8 +32,8 @@ const (
 
 // AttachDisk attaches a vhd to vm
 // the vhd must exist, can be identified by diskName, diskURI, and lun.
-func (az *Cloud) AttachDisk(diskName, diskURI, vmName string, lun int32, cachingMode compute.CachingTypes) error {
-	vm, exists, err := az.getVirtualMachine(vmName)
+func (az *Cloud) AttachDisk(diskName, diskURI string, nodeName types.NodeName, lun int32, cachingMode compute.CachingTypes) error {
+	vm, exists, err := az.getVirtualMachine(nodeName)
 	if err != nil {
 		return err
 	} else if !exists {
@@ -58,6 +59,7 @@ func (az *Cloud) AttachDisk(diskName, diskURI, vmName string, lun int32, caching
 			},
 		},
 	}
+	vmName := mapNodeNameToVMName(nodeName)
 	_, err = az.VirtualMachinesClient.CreateOrUpdate(az.ResourceGroup, vmName, newVM, nil)
 	if err != nil {
 		glog.Errorf("azure attach failed, err: %v", err)
@@ -65,7 +67,7 @@ func (az *Cloud) AttachDisk(diskName, diskURI, vmName string, lun int32, caching
 		if strings.Contains(detail, "Code=\"AcquireDiskLeaseFailed\"") {
 			// if lease cannot be acquired, immediately detach the disk and return the original error
 			glog.Infof("failed to acquire disk lease, try detach")
-			az.DetachDiskByName(diskName, diskURI, vmName)
+			az.DetachDiskByName(diskName, diskURI, nodeName)
 		}
 	} else {
 		glog.V(4).Infof("azure attach succeeded")
@@ -75,11 +77,11 @@ func (az *Cloud) AttachDisk(diskName, diskURI, vmName string, lun int32, caching
 
 // DetachDiskByName detaches a vhd from host
 // the vhd can be identified by diskName or diskURI
-func (az *Cloud) DetachDiskByName(diskName, diskURI, vmName string) error {
-	vm, exists, err := az.getVirtualMachine(vmName)
+func (az *Cloud) DetachDiskByName(diskName, diskURI string, nodeName types.NodeName) error {
+	vm, exists, err := az.getVirtualMachine(nodeName)
 	if err != nil || !exists {
 		// if host doesn't exist, no need to detach
-		glog.Warningf("cannot find node %s, skip detaching disk %s", vmName, diskName)
+		glog.Warningf("cannot find node %s, skip detaching disk %s", nodeName, diskName)
 		return nil
 	}
 
@@ -100,6 +102,7 @@ func (az *Cloud) DetachDiskByName(diskName, diskURI, vmName string) error {
 			},
 		},
 	}
+	vmName := mapNodeNameToVMName(nodeName)
 	_, err = az.VirtualMachinesClient.CreateOrUpdate(az.ResourceGroup, vmName, newVM, nil)
 	if err != nil {
 		glog.Errorf("azure disk detach failed, err: %v", err)
@@ -110,8 +113,8 @@ func (az *Cloud) DetachDiskByName(diskName, diskURI, vmName string) error {
 }
 
 // GetDiskLun finds the lun on the host that the vhd is attached to, given a vhd's diskName and diskURI
-func (az *Cloud) GetDiskLun(diskName, diskURI, vmName string) (int32, error) {
-	vm, exists, err := az.getVirtualMachine(vmName)
+func (az *Cloud) GetDiskLun(diskName, diskURI string, nodeName types.NodeName) (int32, error) {
+	vm, exists, err := az.getVirtualMachine(nodeName)
 	if err != nil {
 		return -1, err
 	} else if !exists {
@@ -130,8 +133,8 @@ func (az *Cloud) GetDiskLun(diskName, diskURI, vmName string) (int32, error) {
 
 // GetNextDiskLun searches all vhd attachment on the host and find unused lun
 // return -1 if all luns are used
-func (az *Cloud) GetNextDiskLun(vmName string) (int32, error) {
-	vm, exists, err := az.getVirtualMachine(vmName)
+func (az *Cloud) GetNextDiskLun(nodeName types.NodeName) (int32, error) {
+	vm, exists, err := az.getVirtualMachine(nodeName)
 	if err != nil {
 		return -1, err
 	} else if !exists {

pkg/cloudprovider/providers/azure/azure_util.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/Azure/azure-sdk-for-go/arm/compute"
 	"github.com/Azure/azure-sdk-for-go/arm/network"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 const (
@@ -202,8 +203,8 @@ outer:
 	return -1, fmt.Errorf("SecurityGroup priorities are exhausted")
 }
 
-func (az *Cloud) getIPForMachine(machineName string) (string, error) {
-	machine, exists, err := az.getVirtualMachine(machineName)
+func (az *Cloud) getIPForMachine(nodeName types.NodeName) (string, error) {
+	machine, exists, err := az.getVirtualMachine(nodeName)
 	if !exists {
 		return "", cloudprovider.InstanceNotFound
 	}

pkg/cloudprovider/providers/azure/azure_wrap.go

@@ -22,6 +22,7 @@ import (
 	"github.com/Azure/azure-sdk-for-go/arm/compute"
 	"github.com/Azure/azure-sdk-for-go/arm/network"
 	"github.com/Azure/go-autorest/autorest"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 // checkExistsFromError inspects an error and returns a true if err is nil,
@@ -38,10 +39,11 @@ func checkResourceExistsFromError(err error) (bool, error) {
 	return false, v
 }
 
-func (az *Cloud) getVirtualMachine(machineName string) (vm compute.VirtualMachine, exists bool, err error) {
+func (az *Cloud) getVirtualMachine(nodeName types.NodeName) (vm compute.VirtualMachine, exists bool, err error) {
 	var realErr error
 
-	vm, err = az.VirtualMachinesClient.Get(az.ResourceGroup, machineName, "")
+	vmName := string(nodeName)
+	vm, err = az.VirtualMachinesClient.Get(az.ResourceGroup, vmName, "")
 
 	exists, realErr = checkResourceExistsFromError(err)
 	if realErr != nil {

pkg/cloudprovider/providers/fake/fake.go

@@ -25,6 +25,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 const ProviderName = "fake"
@@ -49,9 +50,9 @@ type FakeCloud struct {
 	Err           error
 	Calls         []string
 	Addresses     []api.NodeAddress
-	ExtID         map[string]string
-	InstanceTypes map[string]string
-	Machines      []string
+	ExtID         map[types.NodeName]string
+	InstanceTypes map[types.NodeName]string
+	Machines      []types.NodeName
 	NodeResources *api.NodeResources
 	ClusterList   []string
 	MasterName    string
@@ -173,13 +174,13 @@ func (f *FakeCloud) AddSSHKeyToAllInstances(user string, keyData []byte) error {
 }
 
 // Implementation of Instances.CurrentNodeName
-func (f *FakeCloud) CurrentNodeName(hostname string) (string, error) {
-	return hostname, nil
+func (f *FakeCloud) CurrentNodeName(hostname string) (types.NodeName, error) {
+	return types.NodeName(hostname), nil
 }
 
 // NodeAddresses is a test-spy implementation of Instances.NodeAddresses.
 // It adds an entry "node-addresses" into the internal method call record.
-func (f *FakeCloud) NodeAddresses(instance string) ([]api.NodeAddress, error) {
+func (f *FakeCloud) NodeAddresses(instance types.NodeName) ([]api.NodeAddress, error) {
 	f.addCall("node-addresses")
 	return f.Addresses, f.Err
 }
@@ -187,30 +188,30 @@ func (f *FakeCloud) NodeAddresses(instance string) ([]api.NodeAddress, error) {
 // ExternalID is a test-spy implementation of Instances.ExternalID.
 // It adds an entry "external-id" into the internal method call record.
 // It returns an external id to the mapped instance name, if not found, it will return "ext-{instance}"
-func (f *FakeCloud) ExternalID(instance string) (string, error) {
+func (f *FakeCloud) ExternalID(nodeName types.NodeName) (string, error) {
 	f.addCall("external-id")
-	return f.ExtID[instance], f.Err
+	return f.ExtID[nodeName], f.Err
 }
 
-// InstanceID returns the cloud provider ID of the specified instance.
-func (f *FakeCloud) InstanceID(instance string) (string, error) {
+// InstanceID returns the cloud provider ID of the node with the specified Name.
+func (f *FakeCloud) InstanceID(nodeName types.NodeName) (string, error) {
 	f.addCall("instance-id")
-	return f.ExtID[instance], nil
+	return f.ExtID[nodeName], nil
 }
 
 // InstanceType returns the type of the specified instance.
-func (f *FakeCloud) InstanceType(instance string) (string, error) {
+func (f *FakeCloud) InstanceType(instance types.NodeName) (string, error) {
 	f.addCall("instance-type")
 	return f.InstanceTypes[instance], nil
 }
 
 // List is a test-spy implementation of Instances.List.
 // It adds an entry "list" into the internal method call record.
-func (f *FakeCloud) List(filter string) ([]string, error) {
+func (f *FakeCloud) List(filter string) ([]types.NodeName, error) {
 	f.addCall("list")
-	result := []string{}
+	result := []types.NodeName{}
 	for _, machine := range f.Machines {
-		if match, _ := regexp.MatchString(filter, machine); match {
+		if match, _ := regexp.MatchString(filter, string(machine)); match {
 			result = append(result, machine)
 		}
 	}

pkg/cloudprovider/providers/gce/gce.go

@@ -122,16 +122,16 @@ const (
 
 // Disks is interface for manipulation with GCE PDs.
 type Disks interface {
-	// AttachDisk attaches given disk to given instance. Current instance
-	// is used when instanceID is empty string.
-	AttachDisk(diskName, instanceID string, readOnly bool) error
+	// AttachDisk attaches given disk to the node with the specified NodeName.
+	// Current instance is used when instanceID is empty string.
+	AttachDisk(diskName string, nodeName types.NodeName, readOnly bool) error
 
-	// DetachDisk detaches given disk to given instance. Current instance
-	// is used when instanceID is empty string.
-	DetachDisk(devicePath, instanceID string) error
+	// DetachDisk detaches given disk to the node with the specified NodeName.
+	// Current instance is used when nodeName is empty string.
+	DetachDisk(devicePath string, nodeName types.NodeName) error
 
-	// DiskIsAttached checks if a disk is attached to the given node.
-	DiskIsAttached(diskName, instanceID string) (bool, error)
+	// DiskIsAttached checks if a disk is attached to the node with the specified NodeName.
+	DiskIsAttached(diskName string, nodeName types.NodeName) (bool, error)
 
 	// CreateDisk creates a new PD with given properties. Tags are serialized
 	// as JSON into Description field.
@@ -2095,8 +2095,8 @@ func canonicalizeInstanceName(name string) string {
 }
 
 // Implementation of Instances.CurrentNodeName
-func (gce *GCECloud) CurrentNodeName(hostname string) (string, error) {
-	return hostname, nil
+func (gce *GCECloud) CurrentNodeName(hostname string) (types.NodeName, error) {
+	return types.NodeName(hostname), nil
 }
 
 func (gce *GCECloud) AddSSHKeyToAllInstances(user string, keyData []byte) error {
@@ -2145,7 +2145,7 @@ func (gce *GCECloud) AddSSHKeyToAllInstances(user string, keyData []byte) error
 }
 
 // NodeAddresses is an implementation of Instances.NodeAddresses.
-func (gce *GCECloud) NodeAddresses(_ string) ([]api.NodeAddress, error) {
+func (gce *GCECloud) NodeAddresses(_ types.NodeName) ([]api.NodeAddress, error) {
 	internalIP, err := metadata.Get("instance/network-interfaces/0/ip")
 	if err != nil {
 		return nil, fmt.Errorf("couldn't get internal IP: %v", err)
@@ -2172,11 +2172,23 @@ func (gce *GCECloud) isCurrentInstance(instanceID string) bool {
 	return currentInstanceID == canonicalizeInstanceName(instanceID)
 }
 
-// ExternalID returns the cloud provider ID of the specified instance (deprecated).
-func (gce *GCECloud) ExternalID(instance string) (string, error) {
+// mapNodeNameToInstanceName maps a k8s NodeName to a GCE Instance Name
+// This is a simple string cast.
+func mapNodeNameToInstanceName(nodeName types.NodeName) string {
+	return string(nodeName)
+}
+
+// mapInstanceToNodeName maps a GCE Instance to a k8s NodeName
+func mapInstanceToNodeName(instance *compute.Instance) types.NodeName {
+	return types.NodeName(instance.Name)
+}
+
+// ExternalID returns the cloud provider ID of the node with the specified NodeName (deprecated).
+func (gce *GCECloud) ExternalID(nodeName types.NodeName) (string, error) {
+	instanceName := mapNodeNameToInstanceName(nodeName)
 	if gce.useMetadataServer {
 		// Use metadata, if possible, to fetch ID. See issue #12000
-		if gce.isCurrentInstance(instance) {
+		if gce.isCurrentInstance(instanceName) {
 			externalInstanceID, err := getCurrentExternalIDViaMetadata()
 			if err == nil {
 				return externalInstanceID, nil
@@ -2185,15 +2197,16 @@ func (gce *GCECloud) ExternalID(instance string) (string, error) {
 	}
 
 	// Fallback to GCE API call if metadata server fails to retrieve ID
-	inst, err := gce.getInstanceByName(instance)
+	inst, err := gce.getInstanceByName(instanceName)
 	if err != nil {
 		return "", err
 	}
 	return strconv.FormatUint(inst.ID, 10), nil
 }
 
-// InstanceID returns the cloud provider ID of the specified instance.
-func (gce *GCECloud) InstanceID(instanceName string) (string, error) {
+// InstanceID returns the cloud provider ID of the node with the specified NodeName.
+func (gce *GCECloud) InstanceID(nodeName types.NodeName) (string, error) {
+	instanceName := mapNodeNameToInstanceName(nodeName)
 	if gce.useMetadataServer {
 		// Use metadata, if possible, to fetch ID. See issue #12000
 		if gce.isCurrentInstance(instanceName) {
@@ -2210,8 +2223,9 @@ func (gce *GCECloud) InstanceID(instanceName string) (string, error) {
 	return gce.projectID + "/" + instance.Zone + "/" + instance.Name, nil
 }
 
-// InstanceType returns the type of the specified instance.
-func (gce *GCECloud) InstanceType(instanceName string) (string, error) {
+// InstanceType returns the type of the specified node with the specified NodeName.
+func (gce *GCECloud) InstanceType(nodeName types.NodeName) (string, error) {
+	instanceName := mapNodeNameToInstanceName(nodeName)
 	if gce.useMetadataServer {
 		// Use metadata, if possible, to fetch ID. See issue #12000
 		if gce.isCurrentInstance(instanceName) {
@@ -2229,8 +2243,8 @@ func (gce *GCECloud) InstanceType(instanceName string) (string, error) {
 }
 
 // List is an implementation of Instances.List.
-func (gce *GCECloud) List(filter string) ([]string, error) {
-	var instances []string
+func (gce *GCECloud) List(filter string) ([]types.NodeName, error) {
+	var instances []types.NodeName
 	// TODO: Parallelize, although O(zones) so not too bad (N <= 3 typically)
 	for _, zone := range gce.managedZones {
 		pageToken := ""
@@ -2249,7 +2263,7 @@ func (gce *GCECloud) List(filter string) ([]string, error) {
 			}
 			pageToken = res.NextPageToken
 			for _, instance := range res.Items {
-				instances = append(instances, instance.Name)
+				instances = append(instances, mapInstanceToNodeName(instance))
 			}
 		}
 		if page >= maxPages {
@@ -2349,7 +2363,9 @@ func (gce *GCECloud) ListRoutes(clusterName string) ([]*cloudprovider.Route, err
 			}
 
 			target := path.Base(r.NextHopInstance)
-			routes = append(routes, &cloudprovider.Route{Name: r.Name, TargetInstance: target, DestinationCIDR: r.DestRange})
+			// TODO: Should we lastComponent(target) this?
+			targetNodeName := types.NodeName(target) // NodeName == Instance Name on GCE
+			routes = append(routes, &cloudprovider.Route{Name: r.Name, TargetNode: targetNodeName, DestinationCIDR: r.DestRange})
 		}
 	}
 	if page >= maxPages {
@@ -2365,7 +2381,8 @@ func gceNetworkURL(project, network string) string {
 func (gce *GCECloud) CreateRoute(clusterName string, nameHint string, route *cloudprovider.Route) error {
 	routeName := truncateClusterName(clusterName) + "-" + nameHint
 
-	targetInstance, err := gce.getInstanceByName(route.TargetInstance)
+	instanceName := mapNodeNameToInstanceName(route.TargetNode)
+	targetInstance, err := gce.getInstanceByName(instanceName)
 	if err != nil {
 		return err
 	}
@@ -2545,10 +2562,11 @@ func (gce *GCECloud) GetAutoLabelsForPD(name string, zone string) (map[string]st
 	return labels, nil
 }
 
-func (gce *GCECloud) AttachDisk(diskName, instanceID string, readOnly bool) error {
-	instance, err := gce.getInstanceByName(instanceID)
+func (gce *GCECloud) AttachDisk(diskName string, nodeName types.NodeName, readOnly bool) error {
+	instanceName := mapNodeNameToInstanceName(nodeName)
+	instance, err := gce.getInstanceByName(instanceName)
 	if err != nil {
-		return fmt.Errorf("error getting instance %q", instanceID)
+		return fmt.Errorf("error getting instance %q", instanceName)
 	}
 	disk, err := gce.getDiskByName(diskName, instance.Zone)
 	if err != nil {
@@ -2560,7 +2578,7 @@ func (gce *GCECloud) AttachDisk(diskName, instanceID string, readOnly bool) erro
 	}
 	attachedDisk := gce.convertDiskToAttachedDisk(disk, readWrite)
 
-	attachOp, err := gce.service.Instances.AttachDisk(gce.projectID, disk.Zone, instanceID, attachedDisk).Do()
+	attachOp, err := gce.service.Instances.AttachDisk(gce.projectID, disk.Zone, instanceName, attachedDisk).Do()
 	if err != nil {
 		return err
 	}
@@ -2568,19 +2586,20 @@ func (gce *GCECloud) AttachDisk(diskName, instanceID string, readOnly bool) erro
 	return gce.waitForZoneOp(attachOp, disk.Zone)
 }
 
-func (gce *GCECloud) DetachDisk(devicePath, instanceID string) error {
-	inst, err := gce.getInstanceByName(instanceID)
+func (gce *GCECloud) DetachDisk(devicePath string, nodeName types.NodeName) error {
+	instanceName := mapNodeNameToInstanceName(nodeName)
+	inst, err := gce.getInstanceByName(instanceName)
 	if err != nil {
 		if err == cloudprovider.InstanceNotFound {
 			// If instance no longer exists, safe to assume volume is not attached.
 			glog.Warningf(
 				"Instance %q does not exist. DetachDisk will assume PD %q is not attached to it.",
-				instanceID,
+				instanceName,
 				devicePath)
 			return nil
 		}
 
-		return fmt.Errorf("error getting instance %q", instanceID)
+		return fmt.Errorf("error getting instance %q", instanceName)
 	}
 
 	detachOp, err := gce.service.Instances.DetachDisk(gce.projectID, inst.Zone, inst.Name, devicePath).Do()
@@ -2591,14 +2610,15 @@ func (gce *GCECloud) DetachDisk(devicePath, instanceID string) error {
 	return gce.waitForZoneOp(detachOp, inst.Zone)
 }
 
-func (gce *GCECloud) DiskIsAttached(diskName, instanceID string) (bool, error) {
-	instance, err := gce.getInstanceByName(instanceID)
+func (gce *GCECloud) DiskIsAttached(diskName string, nodeName types.NodeName) (bool, error) {
+	instanceName := mapNodeNameToInstanceName(nodeName)
+	instance, err := gce.getInstanceByName(instanceName)
 	if err != nil {
 		if err == cloudprovider.InstanceNotFound {
 			// If instance no longer exists, safe to assume volume is not attached.
 			glog.Warningf(
 				"Instance %q does not exist. DiskIsAttached will assume PD %q is not attached to it.",
-				instanceID,
+				instanceName,
 				diskName)
 			return false, nil
 		}

pkg/cloudprovider/providers/mesos/mesos.go

@@ -30,6 +30,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 const (
@@ -89,8 +90,8 @@ func newMesosCloud(configReader io.Reader) (*MesosCloud, error) {
 }
 
 // Implementation of Instances.CurrentNodeName
-func (c *MesosCloud) CurrentNodeName(hostname string) (string, error) {
-	return hostname, nil
+func (c *MesosCloud) CurrentNodeName(hostname string) (types.NodeName, error) {
+	return types.NodeName(hostname), nil
 }
 
 func (c *MesosCloud) AddSSHKeyToAllInstances(user string, keyData []byte) error {
@@ -190,8 +191,15 @@ func ipAddress(name string) (net.IP, error) {
 	return ipaddr, nil
 }
 
-// ExternalID returns the cloud provider ID of the specified instance (deprecated).
-func (c *MesosCloud) ExternalID(instance string) (string, error) {
+// mapNodeNameToPrivateDNSName maps a k8s NodeName to an mesos hostname.
+// This is a simple string cast
+func mapNodeNameToHostname(nodeName types.NodeName) string {
+	return string(nodeName)
+}
+
+// ExternalID returns the cloud provider ID of the instance with the specified nodeName (deprecated).
+func (c *MesosCloud) ExternalID(nodeName types.NodeName) (string, error) {
+	hostname := mapNodeNameToHostname(nodeName)
 	//TODO(jdef) use a timeout here? 15s?
 	ctx, cancel := context.WithCancel(context.TODO())
 	defer cancel()
@@ -201,7 +209,7 @@ func (c *MesosCloud) ExternalID(instance string) (string, error) {
 		return "", err
 	}
 
-	node := nodes[instance]
+	node := nodes[hostname]
 	if node == nil {
 		return "", cloudprovider.InstanceNotFound
 	}
@@ -213,13 +221,13 @@ func (c *MesosCloud) ExternalID(instance string) (string, error) {
 	return ip.String(), nil
 }
 
-// InstanceID returns the cloud provider ID of the specified instance.
-func (c *MesosCloud) InstanceID(name string) (string, error) {
+// InstanceID returns the cloud provider ID of the instance with the specified nodeName.
+func (c *MesosCloud) InstanceID(nodeName types.NodeName) (string, error) {
 	return "", nil
 }
 
-// InstanceType returns the type of the specified instance.
-func (c *MesosCloud) InstanceType(name string) (string, error) {
+// InstanceType returns the type of the instance with the specified nodeName.
+func (c *MesosCloud) InstanceType(nodeName types.NodeName) (string, error) {
 	return "", nil
 }
 
@@ -241,7 +249,7 @@ func (c *MesosCloud) listNodes() (map[string]*slaveNode, error) {
 
 // List lists instances that match 'filter' which is a regular expression
 // which must match the entire instance name (fqdn).
-func (c *MesosCloud) List(filter string) ([]string, error) {
+func (c *MesosCloud) List(filter string) ([]types.NodeName, error) {
 	nodes, err := c.listNodes()
 	if err != nil {
 		return nil, err
@@ -250,13 +258,13 @@ func (c *MesosCloud) List(filter string) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	addr := []string{}
+	names := []types.NodeName{}
 	for _, node := range nodes {
 		if filterRegex.MatchString(node.hostname) {
-			addr = append(addr, node.hostname)
+			names = append(names, types.NodeName(node.hostname))
 		}
 	}
-	return addr, nil
+	return names, nil
 }
 
 // ListWithKubelet list those instance which have no running kubelet, i.e. the
@@ -275,8 +283,9 @@ func (c *MesosCloud) ListWithoutKubelet() ([]string, error) {
 	return addr, nil
 }
 
-// NodeAddresses returns the addresses of the specified instance.
-func (c *MesosCloud) NodeAddresses(name string) ([]api.NodeAddress, error) {
+// NodeAddresses returns the addresses of the instance with the specified nodeName.
+func (c *MesosCloud) NodeAddresses(nodeName types.NodeName) ([]api.NodeAddress, error) {
+	name := mapNodeNameToHostname(nodeName)
 	ip, err := ipAddress(name)
 	if err != nil {
 		return nil, err

pkg/cloudprovider/providers/mesos/mesos_test.go

@@ -25,6 +25,7 @@ import (
 
 	log "github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 func TestIPAddress(t *testing.T) {
@@ -268,7 +269,7 @@ func Test_ExternalID(t *testing.T) {
 		t.Fatalf("ExternalID did not return InstanceNotFound on an unknown instance")
 	}
 
-	slaveName := "mesos3.internal.company.com"
+	slaveName := types.NodeName("mesos3.internal.company.com")
 	id, err := mesosCloud.ExternalID(slaveName)
 	if id != "" {
 		t.Fatalf("ExternalID should not be able to resolve %q", slaveName)

pkg/cloudprovider/providers/openstack/openstack.go

@@ -37,6 +37,7 @@ import (
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 const ProviderName = "openstack"
@@ -237,9 +238,20 @@ func newOpenStack(cfg Config) (*OpenStack, error) {
 	return &os, nil
 }
 
-func getServerByName(client *gophercloud.ServiceClient, name string) (*servers.Server, error) {
+// mapNodeNameToServerName maps a k8s NodeName to an OpenStack Server Name
+// This is a simple string cast.
+func mapNodeNameToServerName(nodeName types.NodeName) string {
+	return string(nodeName)
+}
+
+// mapServerToNodeName maps an OpenStack Server to a k8s NodeName
+func mapServerToNodeName(server *servers.Server) types.NodeName {
+	return types.NodeName(server.Name)
+}
+
+func getServerByName(client *gophercloud.ServiceClient, name types.NodeName) (*servers.Server, error) {
 	opts := servers.ListOpts{
-		Name:   fmt.Sprintf("^%s$", regexp.QuoteMeta(name)),
+		Name:   fmt.Sprintf("^%s$", regexp.QuoteMeta(mapNodeNameToServerName(name))),
 		Status: "ACTIVE",
 	}
 	pager := servers.List(client, opts)
@@ -270,7 +282,7 @@ func getServerByName(client *gophercloud.ServiceClient, name string) (*servers.S
 	return &serverList[0], nil
 }
 
-func getAddressesByName(client *gophercloud.ServiceClient, name string) ([]api.NodeAddress, error) {
+func getAddressesByName(client *gophercloud.ServiceClient, name types.NodeName) ([]api.NodeAddress, error) {
 	srv, err := getServerByName(client, name)
 	if err != nil {
 		return nil, err
@@ -339,7 +351,7 @@ func getAddressesByName(client *gophercloud.ServiceClient, name string) ([]api.N
 	return addrs, nil
 }
 
-func getAddressByName(client *gophercloud.ServiceClient, name string) (string, error) {
+func getAddressByName(client *gophercloud.ServiceClient, name types.NodeName) (string, error) {
 	addrs, err := getAddressesByName(client, name)
 	if err != nil {
 		return "", err

pkg/cloudprovider/providers/openstack/openstack_instances.go

@@ -29,6 +29,7 @@ import (
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/resource"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 type Instances struct {
@@ -81,7 +82,7 @@ func (os *OpenStack) Instances() (cloudprovider.Instances, bool) {
 	return &Instances{compute, flavor_to_resource}, true
 }
 
-func (i *Instances) List(name_filter string) ([]string, error) {
+func (i *Instances) List(name_filter string) ([]types.NodeName, error) {
 	glog.V(4).Infof("openstack List(%v) called", name_filter)
 
 	opts := servers.ListOpts{
@@ -90,14 +91,14 @@ func (i *Instances) List(name_filter string) ([]string, error) {
 	}
 	pager := servers.List(i.compute, opts)
 
-	ret := make([]string, 0)
+	ret := make([]types.NodeName, 0)
 	err := pager.EachPage(func(page pagination.Page) (bool, error) {
 		sList, err := servers.ExtractServers(page)
 		if err != nil {
 			return false, err
 		}
-		for _, server := range sList {
-			ret = append(ret, server.Name)
+		for i := range sList {
+			ret = append(ret, mapServerToNodeName(&sList[i]))
 		}
 		return true, nil
 	})
@@ -112,15 +113,15 @@ func (i *Instances) List(name_filter string) ([]string, error) {
 }
 
 // Implementation of Instances.CurrentNodeName
-func (i *Instances) CurrentNodeName(hostname string) (string, error) {
-	return hostname, nil
+func (i *Instances) CurrentNodeName(hostname string) (types.NodeName, error) {
+	return types.NodeName(hostname), nil
 }
 
 func (i *Instances) AddSSHKeyToAllInstances(user string, keyData []byte) error {
 	return errors.New("unimplemented")
 }
 
-func (i *Instances) NodeAddresses(name string) ([]api.NodeAddress, error) {
+func (i *Instances) NodeAddresses(name types.NodeName) ([]api.NodeAddress, error) {
 	glog.V(4).Infof("NodeAddresses(%v) called", name)
 
 	addrs, err := getAddressesByName(i.compute, name)
@@ -133,7 +134,7 @@ func (i *Instances) NodeAddresses(name string) ([]api.NodeAddress, error) {
 }
 
 // ExternalID returns the cloud provider ID of the specified instance (deprecated).
-func (i *Instances) ExternalID(name string) (string, error) {
+func (i *Instances) ExternalID(name types.NodeName) (string, error) {
 	srv, err := getServerByName(i.compute, name)
 	if err != nil {
 		if err == ErrNotFound {
@@ -150,7 +151,7 @@ func (os *OpenStack) InstanceID() (string, error) {
 }
 
 // InstanceID returns the cloud provider ID of the specified instance.
-func (i *Instances) InstanceID(name string) (string, error) {
+func (i *Instances) InstanceID(name types.NodeName) (string, error) {
 	srv, err := getServerByName(i.compute, name)
 	if err != nil {
 		return "", err
@@ -161,6 +162,6 @@ func (i *Instances) InstanceID(name string) (string, error) {
 }
 
 // InstanceType returns the type of the specified instance.
-func (i *Instances) InstanceType(name string) (string, error) {
+func (i *Instances) InstanceType(name types.NodeName) (string, error) {
 	return "", nil
 }

pkg/cloudprovider/providers/openstack/openstack_loadbalancer.go

@@ -39,6 +39,7 @@ import (
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/service"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 // Note: when creating a new Loadbalancer (VM), it can take some time before it is ready for use,
@@ -303,8 +304,8 @@ func (lbaas *LbaasV2) GetLoadBalancer(clusterName string, service *api.Service)
 // a list of regions (from config) and query/create loadbalancers in
 // each region.
 
-func (lbaas *LbaasV2) EnsureLoadBalancer(clusterName string, apiService *api.Service, hosts []string) (*api.LoadBalancerStatus, error) {
-	glog.V(4).Infof("EnsureLoadBalancer(%v, %v, %v, %v, %v, %v, %v)", clusterName, apiService.Namespace, apiService.Name, apiService.Spec.LoadBalancerIP, apiService.Spec.Ports, hosts, apiService.Annotations)
+func (lbaas *LbaasV2) EnsureLoadBalancer(clusterName string, apiService *api.Service, nodeNames []string) (*api.LoadBalancerStatus, error) {
+	glog.V(4).Infof("EnsureLoadBalancer(%v, %v, %v, %v, %v, %v, %v)", clusterName, apiService.Namespace, apiService.Name, apiService.Spec.LoadBalancerIP, apiService.Spec.Ports, nodeNames, apiService.Annotations)
 
 	ports := apiService.Spec.Ports
 	if len(ports) == 0 {
@@ -410,8 +411,8 @@ func (lbaas *LbaasV2) EnsureLoadBalancer(clusterName string, apiService *api.Ser
 
 		waitLoadbalancerActiveProvisioningStatus(lbaas.network, loadbalancer.ID)
 
-		for _, host := range hosts {
-			addr, err := getAddressByName(lbaas.compute, host)
+		for _, nodeName := range nodeNames {
+			addr, err := getAddressByName(lbaas.compute, types.NodeName(nodeName))
 			if err != nil {
 				// cleanup what was created so far
 				_ = lbaas.EnsureLoadBalancerDeleted(clusterName, apiService)
@@ -478,9 +479,9 @@ func (lbaas *LbaasV2) EnsureLoadBalancer(clusterName string, apiService *api.Ser
 	return status, nil
 }
 
-func (lbaas *LbaasV2) UpdateLoadBalancer(clusterName string, service *api.Service, hosts []string) error {
+func (lbaas *LbaasV2) UpdateLoadBalancer(clusterName string, service *api.Service, nodeNames []string) error {
 	loadBalancerName := cloudprovider.GetLoadBalancerName(service)
-	glog.V(4).Infof("UpdateLoadBalancer(%v, %v, %v)", clusterName, loadBalancerName, hosts)
+	glog.V(4).Infof("UpdateLoadBalancer(%v, %v, %v)", clusterName, loadBalancerName, nodeNames)
 
 	ports := service.Spec.Ports
 	if len(ports) == 0 {
@@ -536,8 +537,8 @@ func (lbaas *LbaasV2) UpdateLoadBalancer(clusterName string, service *api.Servic
 
 	// Compose Set of member (addresses) that _should_ exist
 	addrs := map[string]empty{}
-	for _, host := range hosts {
-		addr, err := getAddressByName(lbaas.compute, host)
+	for _, nodeName := range nodeNames {
+		addr, err := getAddressByName(lbaas.compute, types.NodeName(nodeName))
 		if err != nil {
 			return err
 		}
@@ -765,8 +766,8 @@ func (lb *LbaasV1) GetLoadBalancer(clusterName string, service *api.Service) (*a
 // a list of regions (from config) and query/create loadbalancers in
 // each region.
 
-func (lb *LbaasV1) EnsureLoadBalancer(clusterName string, apiService *api.Service, hosts []string) (*api.LoadBalancerStatus, error) {
-	glog.V(4).Infof("EnsureLoadBalancer(%v, %v, %v, %v, %v, %v, %v)", clusterName, apiService.Namespace, apiService.Name, apiService.Spec.LoadBalancerIP, apiService.Spec.Ports, hosts, apiService.Annotations)
+func (lb *LbaasV1) EnsureLoadBalancer(clusterName string, apiService *api.Service, nodeNames []string) (*api.LoadBalancerStatus, error) {
+	glog.V(4).Infof("EnsureLoadBalancer(%v, %v, %v, %v, %v, %v, %v)", clusterName, apiService.Namespace, apiService.Name, apiService.Spec.LoadBalancerIP, apiService.Spec.Ports, nodeNames, apiService.Annotations)
 
 	ports := apiService.Spec.Ports
 	if len(ports) > 1 {
@@ -831,8 +832,8 @@ func (lb *LbaasV1) EnsureLoadBalancer(clusterName string, apiService *api.Servic
 		return nil, err
 	}
 
-	for _, host := range hosts {
-		addr, err := getAddressByName(lb.compute, host)
+	for _, nodeName := range nodeNames {
+		addr, err := getAddressByName(lb.compute, types.NodeName(nodeName))
 		if err != nil {
 			return nil, err
 		}
@@ -914,9 +915,9 @@ func (lb *LbaasV1) EnsureLoadBalancer(clusterName string, apiService *api.Servic
 
 }
 
-func (lb *LbaasV1) UpdateLoadBalancer(clusterName string, service *api.Service, hosts []string) error {
+func (lb *LbaasV1) UpdateLoadBalancer(clusterName string, service *api.Service, nodeNames []string) error {
 	loadBalancerName := cloudprovider.GetLoadBalancerName(service)
-	glog.V(4).Infof("UpdateLoadBalancer(%v, %v, %v)", clusterName, loadBalancerName, hosts)
+	glog.V(4).Infof("UpdateLoadBalancer(%v, %v, %v)", clusterName, loadBalancerName, nodeNames)
 
 	vip, err := getVipByName(lb.network, loadBalancerName)
 	if err != nil {
@@ -925,8 +926,8 @@ func (lb *LbaasV1) UpdateLoadBalancer(clusterName string, service *api.Service,
 
 	// Set of member (addresses) that _should_ exist
 	addrs := map[string]bool{}
-	for _, host := range hosts {
-		addr, err := getAddressByName(lb.compute, host)
+	for _, nodeName := range nodeNames {
+		addr, err := getAddressByName(lb.compute, types.NodeName(nodeName))
 		if err != nil {
 			return err
 		}

pkg/cloudprovider/providers/ovirt/ovirt.go

@@ -33,6 +33,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 const ProviderName = "ovirt"
@@ -149,8 +150,9 @@ func (v *OVirtCloud) Routes() (cloudprovider.Routes, bool) {
 	return nil, false
 }
 
-// NodeAddresses returns the NodeAddresses of a particular machine instance
-func (v *OVirtCloud) NodeAddresses(name string) ([]api.NodeAddress, error) {
+// NodeAddresses returns the NodeAddresses of the instance with the specified nodeName.
+func (v *OVirtCloud) NodeAddresses(nodeName types.NodeName) ([]api.NodeAddress, error) {
+	name := mapNodeNameToInstanceName(nodeName)
 	instance, err := v.fetchInstance(name)
 	if err != nil {
 		return nil, err
@@ -174,8 +176,15 @@ func (v *OVirtCloud) NodeAddresses(name string) ([]api.NodeAddress, error) {
 	return []api.NodeAddress{{Type: api.NodeLegacyHostIP, Address: address.String()}}, nil
 }
 
-// ExternalID returns the cloud provider ID of the specified instance (deprecated).
-func (v *OVirtCloud) ExternalID(name string) (string, error) {
+// mapNodeNameToInstanceName maps from a k8s NodeName to an ovirt instance name (the hostname)
+// This is a simple string cast
+func mapNodeNameToInstanceName(nodeName types.NodeName) string {
+	return string(nodeName)
+}
+
+// ExternalID returns the cloud provider ID of the specified node with the specified NodeName (deprecated).
+func (v *OVirtCloud) ExternalID(nodeName types.NodeName) (string, error) {
+	name := mapNodeNameToInstanceName(nodeName)
 	instance, err := v.fetchInstance(name)
 	if err != nil {
 		return "", err
@@ -183,8 +192,9 @@ func (v *OVirtCloud) ExternalID(name string) (string, error) {
 	return instance.UUID, nil
 }
 
-// InstanceID returns the cloud provider ID of the specified instance.
-func (v *OVirtCloud) InstanceID(name string) (string, error) {
+// InstanceID returns the cloud provider ID of the node with the specified NodeName.
+func (v *OVirtCloud) InstanceID(nodeName types.NodeName) (string, error) {
+	name := mapNodeNameToInstanceName(nodeName)
 	instance, err := v.fetchInstance(name)
 	if err != nil {
 		return "", err
@@ -195,7 +205,7 @@ func (v *OVirtCloud) InstanceID(name string) (string, error) {
 }
 
 // InstanceType returns the type of the specified instance.
-func (v *OVirtCloud) InstanceType(name string) (string, error) {
+func (v *OVirtCloud) InstanceType(name types.NodeName) (string, error) {
 	return "", nil
 }
 
@@ -274,17 +284,21 @@ func (m *OVirtInstanceMap) ListSortedNames() []string {
 }
 
 // List enumerates the set of minions instances known by the cloud provider
-func (v *OVirtCloud) List(filter string) ([]string, error) {
+func (v *OVirtCloud) List(filter string) ([]types.NodeName, error) {
 	instances, err := v.fetchAllInstances()
 	if err != nil {
 		return nil, err
 	}
-	return instances.ListSortedNames(), nil
+	var nodeNames []types.NodeName
+	for _, s := range instances.ListSortedNames() {
+		nodeNames = append(nodeNames, types.NodeName(s))
+	}
+	return nodeNames, nil
 }
 
 // Implementation of Instances.CurrentNodeName
-func (v *OVirtCloud) CurrentNodeName(hostname string) (string, error) {
-	return hostname, nil
+func (v *OVirtCloud) CurrentNodeName(hostname string) (types.NodeName, error) {
+	return types.NodeName(hostname), nil
 }
 
 func (v *OVirtCloud) AddSSHKeyToAllInstances(user string, keyData []byte) error {

pkg/cloudprovider/providers/rackspace/rackspace.go

@@ -42,6 +42,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 const ProviderName = "rackspace"
@@ -230,7 +231,7 @@ func (os *Rackspace) Instances() (cloudprovider.Instances, bool) {
 	return &Instances{compute}, true
 }
 
-func (i *Instances) List(name_filter string) ([]string, error) {
+func (i *Instances) List(name_filter string) ([]types.NodeName, error) {
 	glog.V(2).Infof("rackspace List(%v) called", name_filter)
 
 	opts := osservers.ListOpts{
@@ -239,14 +240,14 @@ func (i *Instances) List(name_filter string) ([]string, error) {
 	}
 	pager := servers.List(i.compute, opts)
 
-	ret := make([]string, 0)
+	ret := make([]types.NodeName, 0)
 	err := pager.EachPage(func(page pagination.Page) (bool, error) {
 		sList, err := servers.ExtractServers(page)
 		if err != nil {
 			return false, err
 		}
-		for _, server := range sList {
-			ret = append(ret, server.Name)
+		for i := range sList {
+			ret = append(ret, mapServerToNodeName(&sList[i]))
 		}
 		return true, nil
 	})
@@ -396,23 +397,35 @@ func getAddressByName(api *gophercloud.ServiceClient, name string) (string, erro
 	return getAddressByServer(srv)
 }
 
-func (i *Instances) NodeAddresses(name string) ([]api.NodeAddress, error) {
-	glog.V(2).Infof("NodeAddresses(%v) called", name)
-
-	ip, err := probeNodeAddress(i.compute, name)
+func (i *Instances) NodeAddresses(nodeName types.NodeName) ([]api.NodeAddress, error) {
+	glog.V(2).Infof("NodeAddresses(%v) called", nodeName)
+	serverName := mapNodeNameToServerName(nodeName)
+	ip, err := probeNodeAddress(i.compute, serverName)
 	if err != nil {
 		return nil, err
 	}
 
-	glog.V(2).Infof("NodeAddresses(%v) => %v", name, ip)
+	glog.V(2).Infof("NodeAddresses(%v) => %v", serverName, ip)
 
 	// net.ParseIP().String() is to maintain compatibility with the old code
 	return []api.NodeAddress{{Type: api.NodeLegacyHostIP, Address: net.ParseIP(ip).String()}}, nil
 }
 
-// ExternalID returns the cloud provider ID of the specified instance (deprecated).
-func (i *Instances) ExternalID(name string) (string, error) {
-	return probeInstanceID(i.compute, name)
+// mapNodeNameToServerName maps from a k8s NodeName to a rackspace Server Name
+// This is a simple string cast.
+func mapNodeNameToServerName(nodeName types.NodeName) string {
+	return string(nodeName)
+}
+
+// mapServerToNodeName maps a rackspace Server to an k8s NodeName
+func mapServerToNodeName(s *osservers.Server) types.NodeName {
+	return types.NodeName(s.Name)
+}
+
+// ExternalID returns the cloud provider ID of the node with the specified Name (deprecated).
+func (i *Instances) ExternalID(nodeName types.NodeName) (string, error) {
+	serverName := mapNodeNameToServerName(nodeName)
+	return probeInstanceID(i.compute, serverName)
 }
 
 // InstanceID returns the cloud provider ID of the kubelet's instance.
@@ -420,13 +433,14 @@ func (rs *Rackspace) InstanceID() (string, error) {
 	return readInstanceID()
 }
 
-// InstanceID returns the cloud provider ID of the specified instance.
-func (i *Instances) InstanceID(name string) (string, error) {
-	return probeInstanceID(i.compute, name)
+// InstanceID returns the cloud provider ID of the node with the specified Name.
+func (i *Instances) InstanceID(nodeName types.NodeName) (string, error) {
+	serverName := mapNodeNameToServerName(nodeName)
+	return probeInstanceID(i.compute, serverName)
 }
 
 // InstanceType returns the type of the specified instance.
-func (i *Instances) InstanceType(name string) (string, error) {
+func (i *Instances) InstanceType(name types.NodeName) (string, error) {
 	return "", nil
 }
 
@@ -435,10 +449,10 @@ func (i *Instances) AddSSHKeyToAllInstances(user string, keyData []byte) error {
 }
 
 // Implementation of Instances.CurrentNodeName
-func (i *Instances) CurrentNodeName(hostname string) (string, error) {
+func (i *Instances) CurrentNodeName(hostname string) (types.NodeName, error) {
 	// Beware when changing this, nodename == hostname assumption is crucial to
 	// apiserver => kubelet communication.
-	return hostname, nil
+	return types.NodeName(hostname), nil
 }
 
 func (os *Rackspace) Clusters() (cloudprovider.Clusters, bool) {

pkg/cloudprovider/providers/vsphere/vsphere_test.go

@@ -25,6 +25,7 @@ import (
 
 	"golang.org/x/net/context"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/rand"
 )
 
@@ -186,7 +187,7 @@ func TestInstances(t *testing.T) {
 	}
 	t.Logf("Found ExternalID(%s) = %s\n", srvs[0], externalId)
 
-	nonExistingVM := rand.String(15)
+	nonExistingVM := types.NodeName(rand.String(15))
 	externalId, err = i.ExternalID(nonExistingVM)
 	if err == cloudprovider.InstanceNotFound {
 		t.Logf("VM %s was not found as expected\n", nonExistingVM)

pkg/controller/node/controller_utils.go

@@ -244,7 +244,7 @@ func nodeRunningOutdatedKubelet(node *api.Node) bool {
 	return false
 }
 
-func nodeExistsInCloudProvider(cloud cloudprovider.Interface, nodeName string) (bool, error) {
+func nodeExistsInCloudProvider(cloud cloudprovider.Interface, nodeName types.NodeName) (bool, error) {
 	instances, ok := cloud.Instances()
 	if !ok {
 		return false, fmt.Errorf("%v", ErrCloudInstance)

pkg/controller/node/nodecontroller.go

@@ -37,6 +37,7 @@ import (
 	"k8s.io/kubernetes/pkg/fields"
 	"k8s.io/kubernetes/pkg/labels"
 	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/flowcontrol"
 	"k8s.io/kubernetes/pkg/util/metrics"
 	utilnode "k8s.io/kubernetes/pkg/util/node"
@@ -147,7 +148,7 @@ type NodeController struct {
 	cidrAllocator CIDRAllocator
 
 	forcefullyDeletePod        func(*api.Pod) error
-	nodeExistsInCloudProvider  func(string) (bool, error)
+	nodeExistsInCloudProvider  func(types.NodeName) (bool, error)
 	computeZoneStateFunc       func(nodeConditions []*api.NodeCondition) (int, zoneState)
 	enterPartialDisruptionFunc func(nodeNum int) float32
 	enterFullDisruptionFunc    func(nodeNum int) float32
@@ -229,7 +230,7 @@ func NewNodeController(
 		serviceCIDR:                 serviceCIDR,
 		allocateNodeCIDRs:           allocateNodeCIDRs,
 		forcefullyDeletePod:         func(p *api.Pod) error { return forcefullyDeletePod(kubeClient, p) },
-		nodeExistsInCloudProvider:   func(nodeName string) (bool, error) { return nodeExistsInCloudProvider(cloud, nodeName) },
+		nodeExistsInCloudProvider:   func(nodeName types.NodeName) (bool, error) { return nodeExistsInCloudProvider(cloud, nodeName) },
 		evictionLimiterQPS:          evictionLimiterQPS,
 		secondaryEvictionLimiterQPS: secondaryEvictionLimiterQPS,
 		largeClusterThreshold:       largeClusterThreshold,
@@ -576,7 +577,7 @@ func (nc *NodeController) monitorNodeStatus() error {
 			// Check with the cloud provider to see if the node still exists. If it
 			// doesn't, delete the node immediately.
 			if currentReadyCondition.Status != api.ConditionTrue && nc.cloud != nil {
-				exists, err := nc.nodeExistsInCloudProvider(node.Name)
+				exists, err := nc.nodeExistsInCloudProvider(types.NodeName(node.Name))
 				if err != nil {
 					glog.Errorf("Error determining if node %v exists in cloud: %v", node.Name, err)
 					continue

pkg/controller/node/nodecontroller_test.go

@@ -27,6 +27,7 @@ import (
 	"k8s.io/kubernetes/pkg/client/cache"
 	"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/fake"
 	fakecloud "k8s.io/kubernetes/pkg/cloudprovider/providers/fake"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/diff"
 	"k8s.io/kubernetes/pkg/util/wait"
 )
@@ -1078,7 +1079,7 @@ func TestCloudProviderNoRateLimit(t *testing.T) {
 		testNodeMonitorPeriod, nil, nil, 0, false)
 	nodeController.cloud = &fakecloud.FakeCloud{}
 	nodeController.now = func() unversioned.Time { return unversioned.Date(2016, 1, 1, 12, 0, 0, 0, time.UTC) }
-	nodeController.nodeExistsInCloudProvider = func(nodeName string) (bool, error) {
+	nodeController.nodeExistsInCloudProvider = func(nodeName types.NodeName) (bool, error) {
 		return false, nil
 	}
 	// monitorNodeStatus should allow this node to be immediately deleted

pkg/controller/route/routecontroller.go

@@ -31,6 +31,7 @@ import (
 	"k8s.io/kubernetes/pkg/cloudprovider"
 	"k8s.io/kubernetes/pkg/controller"
 	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/metrics"
 	nodeutil "k8s.io/kubernetes/pkg/util/node"
 	"k8s.io/kubernetes/pkg/util/wait"
@@ -117,11 +118,11 @@ func (rc *RouteController) reconcileNodeRoutes() error {
 
 func (rc *RouteController) reconcile(nodes []api.Node, routes []*cloudprovider.Route) error {
 	// nodeCIDRs maps nodeName->nodeCIDR
-	nodeCIDRs := make(map[string]string)
-	// routeMap maps routeTargetInstance->route
-	routeMap := make(map[string]*cloudprovider.Route)
+	nodeCIDRs := make(map[types.NodeName]string)
+	// routeMap maps routeTargetNode->route
+	routeMap := make(map[types.NodeName]*cloudprovider.Route)
 	for _, route := range routes {
-		routeMap[route.TargetInstance] = route
+		routeMap[route.TargetNode] = route
 	}
 
 	wg := sync.WaitGroup{}
@@ -132,17 +133,18 @@ func (rc *RouteController) reconcile(nodes []api.Node, routes []*cloudprovider.R
 		if node.Spec.PodCIDR == "" {
 			continue
 		}
+		nodeName := types.NodeName(node.Name)
 		// Check if we have a route for this node w/ the correct CIDR.
-		r := routeMap[node.Name]
+		r := routeMap[nodeName]
 		if r == nil || r.DestinationCIDR != node.Spec.PodCIDR {
 			// If not, create the route.
 			route := &cloudprovider.Route{
-				TargetInstance:  node.Name,
+				TargetNode:      nodeName,
 				DestinationCIDR: node.Spec.PodCIDR,
 			}
 			nameHint := string(node.UID)
 			wg.Add(1)
-			go func(nodeName string, nameHint string, route *cloudprovider.Route) {
+			go func(nodeName types.NodeName, nameHint string, route *cloudprovider.Route) {
 				defer wg.Done()
 				for i := 0; i < maxRetries; i++ {
 					startTime := time.Now()
@@ -161,20 +163,20 @@ func (rc *RouteController) reconcile(nodes []api.Node, routes []*cloudprovider.R
 						return
 					}
 				}
-			}(node.Name, nameHint, route)
+			}(nodeName, nameHint, route)
 		} else {
 			// Update condition only if it doesn't reflect the current state.
 			_, condition := api.GetNodeCondition(&node.Status, api.NodeNetworkUnavailable)
 			if condition == nil || condition.Status != api.ConditionFalse {
-				rc.updateNetworkingCondition(node.Name, true)
+				rc.updateNetworkingCondition(types.NodeName(node.Name), true)
 			}
 		}
-		nodeCIDRs[node.Name] = node.Spec.PodCIDR
+		nodeCIDRs[nodeName] = node.Spec.PodCIDR
 	}
 	for _, route := range routes {
 		if rc.isResponsibleForRoute(route) {
 			// Check if this route applies to a node we know about & has correct CIDR.
-			if nodeCIDRs[route.TargetInstance] != route.DestinationCIDR {
+			if nodeCIDRs[route.TargetNode] != route.DestinationCIDR {
 				wg.Add(1)
 				// Delete the route.
 				go func(route *cloudprovider.Route, startTime time.Time) {
@@ -194,7 +196,7 @@ func (rc *RouteController) reconcile(nodes []api.Node, routes []*cloudprovider.R
 	return nil
 }
 
-func (rc *RouteController) updateNetworkingCondition(nodeName string, routeCreated bool) error {
+func (rc *RouteController) updateNetworkingCondition(nodeName types.NodeName, routeCreated bool) error {
 	var err error
 	for i := 0; i < updateNodeStatusMaxRetries; i++ {
 		// Patch could also fail, even though the chance is very slim. So we still do

pkg/controller/route/routecontroller_test.go

@@ -26,6 +26,7 @@ import (
 	"k8s.io/kubernetes/pkg/client/testing/core"
 	"k8s.io/kubernetes/pkg/cloudprovider"
 	fakecloud "k8s.io/kubernetes/pkg/cloudprovider/providers/fake"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 func TestIsResponsibleForRoute(t *testing.T) {
@@ -58,7 +59,7 @@ func TestIsResponsibleForRoute(t *testing.T) {
 		rc := New(nil, nil, myClusterName, cidr)
 		route := &cloudprovider.Route{
 			Name:            testCase.routeName,
-			TargetInstance:  "doesnt-matter-for-this-test",
+			TargetNode:      types.NodeName("doesnt-matter-for-this-test"),
 			DestinationCIDR: testCase.routeCIDR,
 		}
 		if resp := rc.isResponsibleForRoute(route); resp != testCase.expectedResponsible {

pkg/controller/volume/attachdetach/attach_detach_controller.go

@@ -237,7 +237,7 @@ func (adc *attachDetachController) nodeAdd(obj interface{}) {
 		return
 	}
 
-	nodeName := node.Name
+	nodeName := types.NodeName(node.Name)
 	if _, exists := node.Annotations[volumehelper.ControllerManagedAttachAnnotation]; exists {
 		// Node specifies annotation indicating it should be managed by attach
 		// detach controller. Add it to desired state of world.
@@ -258,7 +258,7 @@ func (adc *attachDetachController) nodeDelete(obj interface{}) {
 		return
 	}
 
-	nodeName := node.Name
+	nodeName := types.NodeName(node.Name)
 	if err := adc.desiredStateOfWorld.DeleteNode(nodeName); err != nil {
 		glog.V(10).Infof("%v", err)
 	}
@@ -278,7 +278,9 @@ func (adc *attachDetachController) processPodVolumes(
 		return
 	}
 
-	if !adc.desiredStateOfWorld.NodeExists(pod.Spec.NodeName) {
+	nodeName := types.NodeName(pod.Spec.NodeName)
+
+	if !adc.desiredStateOfWorld.NodeExists(nodeName) {
 		// If the node the pod is scheduled to does not exist in the desired
 		// state of the world data structure, that indicates the node is not
 		// yet managed by the controller. Therefore, ignore the pod.
@@ -288,7 +290,7 @@ func (adc *attachDetachController) processPodVolumes(
 			"Skipping processing of pod %q/%q: it is scheduled to node %q which is not managed by the controller.",
 			pod.Namespace,
 			pod.Name,
-			pod.Spec.NodeName)
+			nodeName)
 		return
 	}
 
@@ -321,7 +323,7 @@ func (adc *attachDetachController) processPodVolumes(
 		if addVolumes {
 			// Add volume to desired state of world
 			_, err := adc.desiredStateOfWorld.AddPod(
-				uniquePodName, pod, volumeSpec, pod.Spec.NodeName)
+				uniquePodName, pod, volumeSpec, nodeName)
 			if err != nil {
 				glog.V(10).Infof(
 					"Failed to add volume %q for pod %q/%q to desiredStateOfWorld. %v",
@@ -345,7 +347,7 @@ func (adc *attachDetachController) processPodVolumes(
 				continue
 			}
 			adc.desiredStateOfWorld.DeletePod(
-				uniquePodName, uniqueVolumeName, pod.Spec.NodeName)
+				uniquePodName, uniqueVolumeName, nodeName)
 		}
 	}
 
@@ -516,7 +518,7 @@ func (adc *attachDetachController) getPVSpecFromCache(
 // corresponding volume in the actual state of the world to indicate that it is
 // mounted.
 func (adc *attachDetachController) processVolumesInUse(
-	nodeName string, volumesInUse []api.UniqueVolumeName) {
+	nodeName types.NodeName, volumesInUse []api.UniqueVolumeName) {
 	glog.V(4).Infof("processVolumesInUse for node %q", nodeName)
 	for _, attachedVolume := range adc.actualStateOfWorld.GetAttachedVolumesForNode(nodeName) {
 		mounted := false

pkg/controller/volume/attachdetach/cache/desired_state_of_world.go

@@ -26,6 +26,7 @@ import (
 	"sync"
 
 	"k8s.io/kubernetes/pkg/api"
+	k8stypes "k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/volume"
 	"k8s.io/kubernetes/pkg/volume/util/operationexecutor"
 	"k8s.io/kubernetes/pkg/volume/util/types"
@@ -45,7 +46,7 @@ type DesiredStateOfWorld interface {
 	// AddNode adds the given node to the list of nodes managed by the attach/
 	// detach controller.
 	// If the node already exists this is a no-op.
-	AddNode(nodeName string)
+	AddNode(nodeName k8stypes.NodeName)
 
 	// AddPod adds the given pod to the list of pods that reference the
 	// specified volume and is scheduled to the specified node.
@@ -57,13 +58,13 @@ type DesiredStateOfWorld interface {
 	// should be attached to the specified node, the volume is implicitly added.
 	// If no node with the name nodeName exists in list of nodes managed by the
 	// attach/detach attached controller, an error is returned.
-	AddPod(podName types.UniquePodName, pod *api.Pod, volumeSpec *volume.Spec, nodeName string) (api.UniqueVolumeName, error)
+	AddPod(podName types.UniquePodName, pod *api.Pod, volumeSpec *volume.Spec, nodeName k8stypes.NodeName) (api.UniqueVolumeName, error)
 
 	// DeleteNode removes the given node from the list of nodes managed by the
 	// attach/detach controller.
 	// If the node does not exist this is a no-op.
 	// If the node exists but has 1 or more child volumes, an error is returned.
-	DeleteNode(nodeName string) error
+	DeleteNode(nodeName k8stypes.NodeName) error
 
 	// DeletePod removes the given pod from the list of pods that reference the
 	// specified volume and are scheduled to the specified node.
@@ -75,16 +76,16 @@ type DesiredStateOfWorld interface {
 	// volumes under the specified node, this is a no-op.
 	// If after deleting the pod, the specified volume contains no other child
 	// pods, the volume is also deleted.
-	DeletePod(podName types.UniquePodName, volumeName api.UniqueVolumeName, nodeName string)
+	DeletePod(podName types.UniquePodName, volumeName api.UniqueVolumeName, nodeName k8stypes.NodeName)
 
 	// NodeExists returns true if the node with the specified name exists in
 	// the list of nodes managed by the attach/detach controller.
-	NodeExists(nodeName string) bool
+	NodeExists(nodeName k8stypes.NodeName) bool
 
 	// VolumeExists returns true if the volume with the specified name exists
 	// in the list of volumes that should be attached to the specified node by
 	// the attach detach controller.
-	VolumeExists(volumeName api.UniqueVolumeName, nodeName string) bool
+	VolumeExists(volumeName api.UniqueVolumeName, nodeName k8stypes.NodeName) bool
 
 	// GetVolumesToAttach generates and returns a list of volumes to attach
 	// and the nodes they should be attached to based on the current desired
@@ -111,13 +112,13 @@ type PodToAdd struct {
 	VolumeName api.UniqueVolumeName
 
 	// nodeName contains the name of this node.
-	NodeName string
+	NodeName k8stypes.NodeName
 }
 
 // NewDesiredStateOfWorld returns a new instance of DesiredStateOfWorld.
 func NewDesiredStateOfWorld(volumePluginMgr *volume.VolumePluginMgr) DesiredStateOfWorld {
 	return &desiredStateOfWorld{
-		nodesManaged:    make(map[string]nodeManaged),
+		nodesManaged:    make(map[k8stypes.NodeName]nodeManaged),
 		volumePluginMgr: volumePluginMgr,
 	}
 }
@@ -126,7 +127,7 @@ type desiredStateOfWorld struct {
 	// nodesManaged is a map containing the set of nodes managed by the attach/
 	// detach controller. The key in this map is the name of the node and the
 	// value is a node object containing more information about the node.
-	nodesManaged map[string]nodeManaged
+	nodesManaged map[k8stypes.NodeName]nodeManaged
 	// volumePluginMgr is the volume plugin manager used to create volume
 	// plugin objects.
 	volumePluginMgr *volume.VolumePluginMgr
@@ -137,7 +138,7 @@ type desiredStateOfWorld struct {
 // controller.
 type nodeManaged struct {
 	// nodeName contains the name of this node.
-	nodeName string
+	nodeName k8stypes.NodeName
 
 	// volumesToAttach is a map containing the set of volumes that should be
 	// attached to this node. The key in the map is the name of the volume and
@@ -172,7 +173,7 @@ type pod struct {
 	podObj *api.Pod
 }
 
-func (dsw *desiredStateOfWorld) AddNode(nodeName string) {
+func (dsw *desiredStateOfWorld) AddNode(nodeName k8stypes.NodeName) {
 	dsw.Lock()
 	defer dsw.Unlock()
 
@@ -188,7 +189,7 @@ func (dsw *desiredStateOfWorld) AddPod(
 	podName types.UniquePodName,
 	podToAdd *api.Pod,
 	volumeSpec *volume.Spec,
-	nodeName string) (api.UniqueVolumeName, error) {
+	nodeName k8stypes.NodeName) (api.UniqueVolumeName, error) {
 	dsw.Lock()
 	defer dsw.Unlock()
 
@@ -236,7 +237,7 @@ func (dsw *desiredStateOfWorld) AddPod(
 	return volumeName, nil
 }
 
-func (dsw *desiredStateOfWorld) DeleteNode(nodeName string) error {
+func (dsw *desiredStateOfWorld) DeleteNode(nodeName k8stypes.NodeName) error {
 	dsw.Lock()
 	defer dsw.Unlock()
 
@@ -261,7 +262,7 @@ func (dsw *desiredStateOfWorld) DeleteNode(nodeName string) error {
 func (dsw *desiredStateOfWorld) DeletePod(
 	podName types.UniquePodName,
 	volumeName api.UniqueVolumeName,
-	nodeName string) {
+	nodeName k8stypes.NodeName) {
 	dsw.Lock()
 	defer dsw.Unlock()
 
@@ -289,7 +290,7 @@ func (dsw *desiredStateOfWorld) DeletePod(
 	}
 }
 
-func (dsw *desiredStateOfWorld) NodeExists(nodeName string) bool {
+func (dsw *desiredStateOfWorld) NodeExists(nodeName k8stypes.NodeName) bool {
 	dsw.RLock()
 	defer dsw.RUnlock()
 
@@ -298,7 +299,7 @@ func (dsw *desiredStateOfWorld) NodeExists(nodeName string) bool {
 }
 
 func (dsw *desiredStateOfWorld) VolumeExists(
-	volumeName api.UniqueVolumeName, nodeName string) bool {
+	volumeName api.UniqueVolumeName, nodeName k8stypes.NodeName) bool {
 	dsw.RLock()
 	defer dsw.RUnlock()
 

pkg/controller/volume/attachdetach/reconciler/reconciler_test.go

@@ -26,6 +26,7 @@ import (
 	"k8s.io/kubernetes/pkg/controller/volume/attachdetach/cache"
 	"k8s.io/kubernetes/pkg/controller/volume/attachdetach/statusupdater"
 	controllervolumetesting "k8s.io/kubernetes/pkg/controller/volume/attachdetach/testing"
+	k8stypes "k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/wait"
 	volumetesting "k8s.io/kubernetes/pkg/volume/testing"
 	"k8s.io/kubernetes/pkg/volume/util/operationexecutor"
@@ -86,7 +87,7 @@ func Test_Run_Positive_OneDesiredVolumeAttach(t *testing.T) {
 	podName := "pod-uid"
 	volumeName := api.UniqueVolumeName("volume-name")
 	volumeSpec := controllervolumetesting.GetTestVolumeSpec(string(volumeName), volumeName)
-	nodeName := "node-name"
+	nodeName := k8stypes.NodeName("node-name")
 	dsw.AddNode(nodeName)
 	volumeExists := dsw.VolumeExists(volumeName, nodeName)
 	if volumeExists {
@@ -132,7 +133,7 @@ func Test_Run_Positive_OneDesiredVolumeAttachThenDetachWithUnmountedVolume(t *te
 	podName := "pod-uid"
 	volumeName := api.UniqueVolumeName("volume-name")
 	volumeSpec := controllervolumetesting.GetTestVolumeSpec(string(volumeName), volumeName)
-	nodeName := "node-name"
+	nodeName := k8stypes.NodeName("node-name")
 	dsw.AddNode(nodeName)
 	volumeExists := dsw.VolumeExists(volumeName, nodeName)
 	if volumeExists {
@@ -199,7 +200,7 @@ func Test_Run_Positive_OneDesiredVolumeAttachThenDetachWithMountedVolume(t *test
 	podName := "pod-uid"
 	volumeName := api.UniqueVolumeName("volume-name")
 	volumeSpec := controllervolumetesting.GetTestVolumeSpec(string(volumeName), volumeName)
-	nodeName := "node-name"
+	nodeName := k8stypes.NodeName("node-name")
 	dsw.AddNode(nodeName)
 	volumeExists := dsw.VolumeExists(volumeName, nodeName)
 	if volumeExists {
@@ -266,7 +267,7 @@ func Test_Run_Negative_OneDesiredVolumeAttachThenDetachWithUnmountedVolumeUpdate
 	podName := "pod-uid"
 	volumeName := api.UniqueVolumeName("volume-name")
 	volumeSpec := controllervolumetesting.GetTestVolumeSpec(string(volumeName), volumeName)
-	nodeName := "node-name"
+	nodeName := k8stypes.NodeName("node-name")
 	dsw.AddNode(nodeName)
 	volumeExists := dsw.VolumeExists(volumeName, nodeName)
 	if volumeExists {

pkg/controller/volume/attachdetach/statusupdater/node_status_updater.go

@@ -60,7 +60,7 @@ type nodeStatusUpdater struct {
 func (nsu *nodeStatusUpdater) UpdateNodeStatuses() error {
 	nodesToUpdate := nsu.actualStateOfWorld.GetVolumesToReportAttached()
 	for nodeName, attachedVolumes := range nodesToUpdate {
-		nodeObj, exists, err := nsu.nodeInformer.GetStore().GetByKey(nodeName)
+		nodeObj, exists, err := nsu.nodeInformer.GetStore().GetByKey(string(nodeName))
 		if nodeObj == nil || !exists || err != nil {
 			// If node does not exist, its status cannot be updated, log error and move on.
 			glog.V(5).Infof(
@@ -105,7 +105,7 @@ func (nsu *nodeStatusUpdater) UpdateNodeStatuses() error {
 				err)
 		}
 
-		_, err = nsu.kubeClient.Core().Nodes().PatchStatus(nodeName, patchBytes)
+		_, err = nsu.kubeClient.Core().Nodes().PatchStatus(string(nodeName), patchBytes)
 		if err != nil {
 			// If update node status fails, reset flag statusUpdateNeeded back to true
 			// to indicate this node status needs to be udpated again

pkg/generated/openapi/zz_generated.openapi.go

@@ -7735,7 +7735,7 @@ var OpenAPIDefinitions *common.OpenAPIDefinitions = &common.OpenAPIDefinitions{
 					},
 					"host": {
 						SchemaProps: spec.SchemaProps{
-							Description: "Host name on which the event is generated.",
+							Description: "Node name on which the event is generated.",
 							Type:        []string{"string"},
 							Format:      "",
 						},

pkg/genericapiserver/config.go

@@ -426,11 +426,15 @@ func DefaultAndValidateRunOptions(options *options.ServerRunOptions) {
 			if !supported {
 				glog.Fatalf("GCE cloud provider has no instances.  this shouldn't happen. exiting.")
 			}
-			name, err := os.Hostname()
+			hostname, err := os.Hostname()
 			if err != nil {
 				glog.Fatalf("Failed to get hostname: %v", err)
 			}
-			addrs, err := instances.NodeAddresses(name)
+			nodeName, err := instances.CurrentNodeName(hostname)
+			if err != nil {
+				glog.Fatalf("Failed to get NodeName: %v", err)
+			}
+			addrs, err := instances.NodeAddresses(nodeName)
 			if err != nil {
 				glog.Warningf("Unable to obtain external host address from cloud provider: %v", err)
 			} else {

pkg/kubelet/config/apiserver.go

@@ -23,11 +23,12 @@ import (
 	clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
 	"k8s.io/kubernetes/pkg/fields"
 	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 // NewSourceApiserver creates a config source that watches and pulls from the apiserver.
-func NewSourceApiserver(c *clientset.Clientset, nodeName string, updates chan<- interface{}) {
-	lw := cache.NewListWatchFromClient(c.CoreClient, "pods", api.NamespaceAll, fields.OneTermEqualSelector(api.PodHostField, nodeName))
+func NewSourceApiserver(c *clientset.Clientset, nodeName types.NodeName, updates chan<- interface{}) {
+	lw := cache.NewListWatchFromClient(c.CoreClient, "pods", api.NamespaceAll, fields.OneTermEqualSelector(api.PodHostField, string(nodeName)))
 	newSourceApiserverFromLW(lw, updates)
 }
 

pkg/kubelet/config/common.go

@@ -35,11 +35,11 @@ import (
 )
 
 // Generate a pod name that is unique among nodes by appending the nodeName.
-func generatePodName(name, nodeName string) string {
+func generatePodName(name string, nodeName types.NodeName) string {
 	return fmt.Sprintf("%s-%s", name, nodeName)
 }
 
-func applyDefaults(pod *api.Pod, source string, isFile bool, nodeName string) error {
+func applyDefaults(pod *api.Pod, source string, isFile bool, nodeName types.NodeName) error {
 	if len(pod.UID) == 0 {
 		hasher := md5.New()
 		if isFile {
@@ -62,7 +62,7 @@ func applyDefaults(pod *api.Pod, source string, isFile bool, nodeName string) er
 	glog.V(5).Infof("Using namespace %q for pod %q from %s", pod.Namespace, pod.Name, source)
 
 	// Set the Host field to indicate this pod is scheduled on the current node.
-	pod.Spec.NodeName = nodeName
+	pod.Spec.NodeName = string(nodeName)
 
 	pod.ObjectMeta.SelfLink = getSelfLink(pod.Name, pod.Namespace)
 

pkg/kubelet/config/file.go

@@ -30,15 +30,16 @@ import (
 	"k8s.io/kubernetes/pkg/util/wait"
 
 	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 type sourceFile struct {
 	path     string
-	nodeName string
+	nodeName types.NodeName
 	updates  chan<- interface{}
 }
 
-func NewSourceFile(path string, nodeName string, period time.Duration, updates chan<- interface{}) {
+func NewSourceFile(path string, nodeName types.NodeName, period time.Duration, updates chan<- interface{}) {
 	config := &sourceFile{
 		path:     path,
 		nodeName: nodeName,

pkg/kubelet/config/file_test.go

@@ -29,6 +29,7 @@ import (
 	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/securitycontext"
+	"k8s.io/kubernetes/pkg/types"
 	utiltesting "k8s.io/kubernetes/pkg/util/testing"
 	"k8s.io/kubernetes/pkg/util/wait"
 )
@@ -71,7 +72,7 @@ func writeTestFile(t *testing.T, dir, name string, contents string) *os.File {
 }
 
 func TestReadPodsFromFile(t *testing.T) {
-	hostname := "random-test-hostname"
+	nodeName := "random-test-hostname"
 	grace := int64(30)
 	var testCases = []struct {
 		desc     string
@@ -100,14 +101,14 @@ func TestReadPodsFromFile(t *testing.T) {
 			},
 			expected: CreatePodUpdate(kubetypes.SET, kubetypes.FileSource, &api.Pod{
 				ObjectMeta: api.ObjectMeta{
-					Name:        "test-" + hostname,
+					Name:        "test-" + nodeName,
 					UID:         "12345",
 					Namespace:   "mynamespace",
 					Annotations: map[string]string{kubetypes.ConfigHashAnnotationKey: "12345"},
-					SelfLink:    getSelfLink("test-"+hostname, "mynamespace"),
+					SelfLink:    getSelfLink("test-"+nodeName, "mynamespace"),
 				},
 				Spec: api.PodSpec{
-					NodeName:                      hostname,
+					NodeName:                      nodeName,
 					RestartPolicy:                 api.RestartPolicyAlways,
 					DNSPolicy:                     api.DNSClusterFirst,
 					TerminationGracePeriodSeconds: &grace,
@@ -142,7 +143,7 @@ func TestReadPodsFromFile(t *testing.T) {
 			defer os.Remove(file.Name())
 
 			ch := make(chan interface{})
-			NewSourceFile(file.Name(), hostname, time.Millisecond, ch)
+			NewSourceFile(file.Name(), types.NodeName(nodeName), time.Millisecond, ch)
 			select {
 			case got := <-ch:
 				update := got.(kubetypes.PodUpdate)

pkg/kubelet/config/http.go

@@ -29,19 +29,20 @@ import (
 	"k8s.io/kubernetes/pkg/util/wait"
 
 	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 type sourceURL struct {
 	url         string
 	header      http.Header
-	nodeName    string
+	nodeName    types.NodeName
 	updates     chan<- interface{}
 	data        []byte
 	failureLogs int
 	client      *http.Client
 }
 
-func NewSourceURL(url string, header http.Header, nodeName string, period time.Duration, updates chan<- interface{}) {
+func NewSourceURL(url string, header http.Header, nodeName types.NodeName, period time.Duration, updates chan<- interface{}) {
 	config := &sourceURL{
 		url:      url,
 		header:   header,

pkg/kubelet/config/http_test.go

@@ -29,6 +29,7 @@ import (
 	"k8s.io/kubernetes/pkg/api/validation"
 	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
 	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/types"
 	utiltesting "k8s.io/kubernetes/pkg/util/testing"
 )
 
@@ -121,7 +122,7 @@ func TestExtractInvalidPods(t *testing.T) {
 }
 
 func TestExtractPodsFromHTTP(t *testing.T) {
-	hostname := "different-value"
+	nodeName := "different-value"
 
 	grace := int64(30)
 	var testCases = []struct {
@@ -142,7 +143,7 @@ func TestExtractPodsFromHTTP(t *testing.T) {
 					Namespace: "mynamespace",
 				},
 				Spec: api.PodSpec{
-					NodeName:        hostname,
+					NodeName:        string(nodeName),
 					Containers:      []api.Container{{Name: "1", Image: "foo", ImagePullPolicy: api.PullAlways}},
 					SecurityContext: &api.PodSecurityContext{},
 				},
@@ -155,13 +156,13 @@ func TestExtractPodsFromHTTP(t *testing.T) {
 				&api.Pod{
 					ObjectMeta: api.ObjectMeta{
 						UID:         "111",
-						Name:        "foo" + "-" + hostname,
+						Name:        "foo" + "-" + nodeName,
 						Namespace:   "mynamespace",
 						Annotations: map[string]string{kubetypes.ConfigHashAnnotationKey: "111"},
-						SelfLink:    getSelfLink("foo-"+hostname, "mynamespace"),
+						SelfLink:    getSelfLink("foo-"+nodeName, "mynamespace"),
 					},
 					Spec: api.PodSpec{
-						NodeName:                      hostname,
+						NodeName:                      nodeName,
 						RestartPolicy:                 api.RestartPolicyAlways,
 						DNSPolicy:                     api.DNSClusterFirst,
 						SecurityContext:               &api.PodSecurityContext{},
@@ -193,7 +194,7 @@ func TestExtractPodsFromHTTP(t *testing.T) {
 							UID:  "111",
 						},
 						Spec: api.PodSpec{
-							NodeName:        hostname,
+							NodeName:        nodeName,
 							Containers:      []api.Container{{Name: "1", Image: "foo", ImagePullPolicy: api.PullAlways}},
 							SecurityContext: &api.PodSecurityContext{},
 						},
@@ -207,7 +208,7 @@ func TestExtractPodsFromHTTP(t *testing.T) {
 							UID:  "222",
 						},
 						Spec: api.PodSpec{
-							NodeName:        hostname,
+							NodeName:        nodeName,
 							Containers:      []api.Container{{Name: "2", Image: "bar:bartag", ImagePullPolicy: ""}},
 							SecurityContext: &api.PodSecurityContext{},
 						},
@@ -222,13 +223,13 @@ func TestExtractPodsFromHTTP(t *testing.T) {
 				&api.Pod{
 					ObjectMeta: api.ObjectMeta{
 						UID:         "111",
-						Name:        "foo" + "-" + hostname,
+						Name:        "foo" + "-" + nodeName,
 						Namespace:   "default",
 						Annotations: map[string]string{kubetypes.ConfigHashAnnotationKey: "111"},
-						SelfLink:    getSelfLink("foo-"+hostname, kubetypes.NamespaceDefault),
+						SelfLink:    getSelfLink("foo-"+nodeName, kubetypes.NamespaceDefault),
 					},
 					Spec: api.PodSpec{
-						NodeName:                      hostname,
+						NodeName:                      nodeName,
 						RestartPolicy:                 api.RestartPolicyAlways,
 						DNSPolicy:                     api.DNSClusterFirst,
 						TerminationGracePeriodSeconds: &grace,
@@ -248,13 +249,13 @@ func TestExtractPodsFromHTTP(t *testing.T) {
 				&api.Pod{
 					ObjectMeta: api.ObjectMeta{
 						UID:         "222",
-						Name:        "bar" + "-" + hostname,
+						Name:        "bar" + "-" + nodeName,
 						Namespace:   "default",
 						Annotations: map[string]string{kubetypes.ConfigHashAnnotationKey: "222"},
-						SelfLink:    getSelfLink("bar-"+hostname, kubetypes.NamespaceDefault),
+						SelfLink:    getSelfLink("bar-"+nodeName, kubetypes.NamespaceDefault),
 					},
 					Spec: api.PodSpec{
-						NodeName:                      hostname,
+						NodeName:                      nodeName,
 						RestartPolicy:                 api.RestartPolicyAlways,
 						DNSPolicy:                     api.DNSClusterFirst,
 						TerminationGracePeriodSeconds: &grace,
@@ -291,7 +292,7 @@ func TestExtractPodsFromHTTP(t *testing.T) {
 		testServer := httptest.NewServer(&fakeHandler)
 		defer testServer.Close()
 		ch := make(chan interface{}, 1)
-		c := sourceURL{testServer.URL, http.Header{}, hostname, ch, nil, 0, http.DefaultClient}
+		c := sourceURL{testServer.URL, http.Header{}, types.NodeName(nodeName), ch, nil, 0, http.DefaultClient}
 		if err := c.extractFromURL(); err != nil {
 			t.Errorf("%s: Unexpected error: %v", testCase.desc, err)
 			continue

pkg/kubelet/kubelet.go

@@ -237,7 +237,7 @@ type KubeletDeps struct {
 
 // makePodSourceConfig creates a config.PodConfig from the given
 // KubeletConfiguration or returns an error.
-func makePodSourceConfig(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *KubeletDeps, nodeName string) (*config.PodConfig, error) {
+func makePodSourceConfig(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *KubeletDeps, nodeName types.NodeName) (*config.PodConfig, error) {
 	manifestURLHeader := make(http.Header)
 	if kubeCfg.ManifestURLHeader != "" {
 		pieces := strings.Split(kubeCfg.ManifestURLHeader, ":")
@@ -292,7 +292,7 @@ func NewMainKubelet(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *Kub
 
 	hostname := nodeutil.GetHostname(kubeCfg.HostnameOverride)
 	// Query the cloud provider for our node name, default to hostname
-	nodeName := hostname
+	nodeName := types.NodeName(hostname)
 	if kubeDeps.Cloud != nil {
 		var err error
 		instances, ok := kubeDeps.Cloud.Instances()
@@ -392,7 +392,7 @@ func NewMainKubelet(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *Kub
 	if kubeClient != nil {
 		// TODO: cache.NewListWatchFromClient is limited as it takes a client implementation rather
 		// than an interface. There is no way to construct a list+watcher using resource name.
-		fieldSelector := fields.Set{api.ObjectNameField: nodeName}.AsSelector()
+		fieldSelector := fields.Set{api.ObjectNameField: string(nodeName)}.AsSelector()
 		listWatch := &cache.ListWatch{
 			ListFunc: func(options api.ListOptions) (runtime.Object, error) {
 				options.FieldSelector = fieldSelector
@@ -413,7 +413,7 @@ func NewMainKubelet(kubeCfg *componentconfig.KubeletConfiguration, kubeDeps *Kub
 	// TODO: what is namespace for node?
 	nodeRef := &api.ObjectReference{
 		Kind:      "Node",
-		Name:      nodeName,
+		Name:      string(nodeName),
 		UID:       types.UID(nodeName),
 		Namespace: "",
 	}
@@ -798,7 +798,7 @@ type Kubelet struct {
 	kubeletConfiguration componentconfig.KubeletConfiguration
 
 	hostname      string
-	nodeName      string
+	nodeName      types.NodeName
 	dockerClient  dockertools.DockerInterface
 	runtimeCache  kubecontainer.RuntimeCache
 	kubeClient    clientset.Interface

pkg/kubelet/kubelet_getters.go

@@ -191,7 +191,7 @@ func (kl *Kubelet) GetNode() (*api.Node, error) {
 	if kl.standaloneMode {
 		return kl.initialNode()
 	}
-	return kl.nodeInfo.GetNodeInfo(kl.nodeName)
+	return kl.nodeInfo.GetNodeInfo(string(kl.nodeName))
 }
 
 // getNodeAnyWay() must return a *api.Node which is required by RunGeneralPredicates().
@@ -201,7 +201,7 @@ func (kl *Kubelet) GetNode() (*api.Node, error) {
 // zero capacity, and the default labels.
 func (kl *Kubelet) getNodeAnyWay() (*api.Node, error) {
 	if !kl.standaloneMode {
-		if n, err := kl.nodeInfo.GetNodeInfo(kl.nodeName); err == nil {
+		if n, err := kl.nodeInfo.GetNodeInfo(string(kl.nodeName)); err == nil {
 			return n, nil
 		}
 	}

pkg/kubelet/kubelet_node_status.go

@@ -98,7 +98,7 @@ func (kl *Kubelet) tryRegisterWithApiServer(node *api.Node) bool {
 		return false
 	}
 
-	existingNode, err := kl.kubeClient.Core().Nodes().Get(kl.nodeName)
+	existingNode, err := kl.kubeClient.Core().Nodes().Get(string(kl.nodeName))
 	if err != nil {
 		glog.Errorf("Unable to register node %q with API server: error getting existing node: %v", kl.nodeName, err)
 		return false
@@ -173,7 +173,7 @@ func (kl *Kubelet) reconcileCMADAnnotationWithExistingNode(node, existingNode *a
 func (kl *Kubelet) initialNode() (*api.Node, error) {
 	node := &api.Node{
 		ObjectMeta: api.ObjectMeta{
-			Name: kl.nodeName,
+			Name: string(kl.nodeName),
 			Labels: map[string]string{
 				unversioned.LabelHostname: kl.hostname,
 				unversioned.LabelOS:       goRuntime.GOOS,
@@ -309,7 +309,7 @@ func (kl *Kubelet) updateNodeStatus() error {
 // tryUpdateNodeStatus tries to update node status to master. If ReconcileCBR0
 // is set, this function will also confirm that cbr0 is configured correctly.
 func (kl *Kubelet) tryUpdateNodeStatus() error {
-	node, err := kl.kubeClient.Core().Nodes().Get(kl.nodeName)
+	node, err := kl.kubeClient.Core().Nodes().Get(string(kl.nodeName))
 	if err != nil {
 		return fmt.Errorf("error getting node %q: %v", kl.nodeName, err)
 	}

pkg/kubelet/kubelet_test.go

@@ -137,7 +137,7 @@ func newTestKubeletWithImageList(
 	kubelet.os = &containertest.FakeOS{}
 
 	kubelet.hostname = testKubeletHostname
-	kubelet.nodeName = testKubeletHostname
+	kubelet.nodeName = types.NodeName(testKubeletHostname)
 	kubelet.runtimeState = newRuntimeState(maxWaitForContainerRuntime)
 	kubelet.runtimeState.setNetworkState(nil)
 	kubelet.networkPlugin, _ = network.InitNetworkPlugin([]network.NetworkPlugin{}, "", nettest.NewFakeHost(nil), componentconfig.HairpinNone, kubelet.nonMasqueradeCIDR, 1440)
@@ -220,7 +220,7 @@ func newTestKubeletWithImageList(
 	kubelet.resourceAnalyzer = stats.NewResourceAnalyzer(kubelet, volumeStatsAggPeriod, kubelet.containerRuntime)
 	nodeRef := &api.ObjectReference{
 		Kind:      "Node",
-		Name:      kubelet.nodeName,
+		Name:      string(kubelet.nodeName),
 		UID:       types.UID(kubelet.nodeName),
 		Namespace: "",
 	}
@@ -241,7 +241,7 @@ func newTestKubeletWithImageList(
 	kubelet.mounter = &mount.FakeMounter{}
 	kubelet.volumeManager, err = kubeletvolume.NewVolumeManager(
 		controllerAttachDetachEnabled,
-		kubelet.hostname,
+		kubelet.nodeName,
 		kubelet.podManager,
 		fakeKubeClient,
 		kubelet.volumePluginMgr,
@@ -1933,7 +1933,7 @@ func TestHandlePortConflicts(t *testing.T) {
 
 	kl.nodeLister = testNodeLister{nodes: []api.Node{
 		{
-			ObjectMeta: api.ObjectMeta{Name: kl.nodeName},
+			ObjectMeta: api.ObjectMeta{Name: string(kl.nodeName)},
 			Status: api.NodeStatus{
 				Allocatable: api.ResourceList{
 					api.ResourcePods: *resource.NewQuantity(110, resource.DecimalSI),
@@ -1943,7 +1943,7 @@ func TestHandlePortConflicts(t *testing.T) {
 	}}
 	kl.nodeInfo = testNodeInfo{nodes: []api.Node{
 		{
-			ObjectMeta: api.ObjectMeta{Name: kl.nodeName},
+			ObjectMeta: api.ObjectMeta{Name: string(kl.nodeName)},
 			Status: api.NodeStatus{
 				Allocatable: api.ResourceList{
 					api.ResourcePods: *resource.NewQuantity(110, resource.DecimalSI),
@@ -1952,7 +1952,7 @@ func TestHandlePortConflicts(t *testing.T) {
 		},
 	}}
 
-	spec := api.PodSpec{NodeName: kl.nodeName, Containers: []api.Container{{Ports: []api.ContainerPort{{HostPort: 80}}}}}
+	spec := api.PodSpec{NodeName: string(kl.nodeName), Containers: []api.Container{{Ports: []api.ContainerPort{{HostPort: 80}}}}}
 	pods := []*api.Pod{
 		podWithUidNameNsSpec("123456789", "newpod", "foo", spec),
 		podWithUidNameNsSpec("987654321", "oldpod", "foo", spec),
@@ -2086,7 +2086,7 @@ func TestHandleMemExceeded(t *testing.T) {
 	testKubelet.fakeCadvisor.On("ImagesFsInfo").Return(cadvisorapiv2.FsInfo{}, nil)
 	testKubelet.fakeCadvisor.On("RootFsInfo").Return(cadvisorapiv2.FsInfo{}, nil)
 
-	spec := api.PodSpec{NodeName: kl.nodeName,
+	spec := api.PodSpec{NodeName: string(kl.nodeName),
 		Containers: []api.Container{{Resources: api.ResourceRequirements{
 			Requests: api.ResourceList{
 				"memory": resource.MustParse("90"),
@@ -3312,7 +3312,7 @@ func TestHandlePodAdditionsInvokesPodAdmitHandlers(t *testing.T) {
 	kl := testKubelet.kubelet
 	kl.nodeLister = testNodeLister{nodes: []api.Node{
 		{
-			ObjectMeta: api.ObjectMeta{Name: kl.nodeName},
+			ObjectMeta: api.ObjectMeta{Name: string(kl.nodeName)},
 			Status: api.NodeStatus{
 				Allocatable: api.ResourceList{
 					api.ResourcePods: *resource.NewQuantity(110, resource.DecimalSI),
@@ -3322,7 +3322,7 @@ func TestHandlePodAdditionsInvokesPodAdmitHandlers(t *testing.T) {
 	}}
 	kl.nodeInfo = testNodeInfo{nodes: []api.Node{
 		{
-			ObjectMeta: api.ObjectMeta{Name: kl.nodeName},
+			ObjectMeta: api.ObjectMeta{Name: string(kl.nodeName)},
 			Status: api.NodeStatus{
 				Allocatable: api.ResourceList{
 					api.ResourcePods: *resource.NewQuantity(110, resource.DecimalSI),

pkg/kubelet/runonce_test.go

@@ -94,7 +94,7 @@ func TestRunOnce(t *testing.T) {
 	}
 	kb.volumeManager, err = volumemanager.NewVolumeManager(
 		true,
-		kb.hostname,
+		kb.nodeName,
 		kb.podManager,
 		kb.kubeClient,
 		kb.volumePluginMgr,
@@ -109,7 +109,7 @@ func TestRunOnce(t *testing.T) {
 	kb.resourceAnalyzer = stats.NewResourceAnalyzer(kb, volumeStatsAggPeriod, kb.containerRuntime)
 	nodeRef := &api.ObjectReference{
 		Kind:      "Node",
-		Name:      kb.nodeName,
+		Name:      string(kb.nodeName),
 		UID:       types.UID(kb.nodeName),
 		Namespace: "",
 	}

pkg/kubelet/util/csr/csr.go

@@ -25,6 +25,7 @@ import (
 	"k8s.io/kubernetes/pkg/apis/certificates"
 	unversionedcertificates "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/certificates/unversioned"
 	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/types"
 	certutil "k8s.io/kubernetes/pkg/util/cert"
 	"k8s.io/kubernetes/pkg/watch"
 )
@@ -33,7 +34,7 @@ import (
 // then it will watch the object's status, once approved by API server, it will return the API
 // server's issued certificate (pem-encoded). If there is any errors, or the watch timeouts,
 // it will return an error. This is intended for use on nodes (kubelet and kubeadm).
-func RequestNodeCertificate(client unversionedcertificates.CertificateSigningRequestInterface, privateKeyData []byte, nodeName string) (certData []byte, err error) {
+func RequestNodeCertificate(client unversionedcertificates.CertificateSigningRequestInterface, privateKeyData []byte, nodeName types.NodeName) (certData []byte, err error) {
 	subject := &pkix.Name{
 		Organization: []string{"system:nodes"},
 		CommonName:   fmt.Sprintf("system:node:%s", nodeName),

pkg/kubelet/volumemanager/cache/actual_state_of_world.go

@@ -160,7 +160,7 @@ type AttachedVolume struct {
 
 // NewActualStateOfWorld returns a new instance of ActualStateOfWorld.
 func NewActualStateOfWorld(
-	nodeName string,
+	nodeName types.NodeName,
 	volumePluginMgr *volume.VolumePluginMgr) ActualStateOfWorld {
 	return &actualStateOfWorld{
 		nodeName:        nodeName,
@@ -185,7 +185,7 @@ func IsRemountRequiredError(err error) bool {
 
 type actualStateOfWorld struct {
 	// nodeName is the name of this node. This value is passed to Attach/Detach
-	nodeName string
+	nodeName types.NodeName
 	// attachedVolumes is a map containing the set of volumes the kubelet volume
 	// manager believes to be successfully attached to this node. Volume types
 	// that do not implement an attacher interface are assumed to be in this
@@ -271,12 +271,12 @@ type mountedPod struct {
 }
 
 func (asw *actualStateOfWorld) MarkVolumeAsAttached(
-	volumeName api.UniqueVolumeName, volumeSpec *volume.Spec, _, devicePath string) error {
+	volumeName api.UniqueVolumeName, volumeSpec *volume.Spec, _ types.NodeName, devicePath string) error {
 	return asw.addVolume(volumeName, volumeSpec, devicePath)
 }
 
 func (asw *actualStateOfWorld) MarkVolumeAsDetached(
-	volumeName api.UniqueVolumeName, nodeName string) {
+	volumeName api.UniqueVolumeName, nodeName types.NodeName) {
 	asw.DeleteVolume(volumeName)
 }
 
@@ -296,11 +296,11 @@ func (asw *actualStateOfWorld) MarkVolumeAsMounted(
 		volumeGidValue)
 }
 
-func (asw *actualStateOfWorld) AddVolumeToReportAsAttached(volumeName api.UniqueVolumeName, nodeName string) {
+func (asw *actualStateOfWorld) AddVolumeToReportAsAttached(volumeName api.UniqueVolumeName, nodeName types.NodeName) {
 	// no operation for kubelet side
 }
 
-func (asw *actualStateOfWorld) RemoveVolumeFromReportAsAttached(volumeName api.UniqueVolumeName, nodeName string) error {
+func (asw *actualStateOfWorld) RemoveVolumeFromReportAsAttached(volumeName api.UniqueVolumeName, nodeName types.NodeName) error {
 	// no operation for kubelet side
 	return nil
 }

pkg/kubelet/volumemanager/reconciler/reconciler.go

@@ -71,7 +71,7 @@ type Reconciler interface {
 //   successive executions
 // waitForAttachTimeout - the amount of time the Mount function will wait for
 //   the volume to be attached
-// hostName - the hostname for this node, used by Attach and Detach methods
+// nodeName - the Name for this node, used by Attach and Detach methods
 // desiredStateOfWorld - cache containing the desired state of the world
 // actualStateOfWorld - cache containing the actual state of the world
 // operationExecutor - used to trigger attach/detach/mount/unmount operations
@@ -85,7 +85,7 @@ func NewReconciler(
 	loopSleepDuration time.Duration,
 	reconstructDuration time.Duration,
 	waitForAttachTimeout time.Duration,
-	hostName string,
+	nodeName types.NodeName,
 	desiredStateOfWorld cache.DesiredStateOfWorld,
 	actualStateOfWorld cache.ActualStateOfWorld,
 	operationExecutor operationexecutor.OperationExecutor,
@@ -98,7 +98,7 @@ func NewReconciler(
 		loopSleepDuration:             loopSleepDuration,
 		reconstructDuration:           reconstructDuration,
 		waitForAttachTimeout:          waitForAttachTimeout,
-		hostName:                      hostName,
+		nodeName:                      nodeName,
 		desiredStateOfWorld:           desiredStateOfWorld,
 		actualStateOfWorld:            actualStateOfWorld,
 		operationExecutor:             operationExecutor,
@@ -115,7 +115,7 @@ type reconciler struct {
 	loopSleepDuration             time.Duration
 	reconstructDuration           time.Duration
 	waitForAttachTimeout          time.Duration
-	hostName                      string
+	nodeName                      types.NodeName
 	desiredStateOfWorld           cache.DesiredStateOfWorld
 	actualStateOfWorld            cache.ActualStateOfWorld
 	operationExecutor             operationexecutor.OperationExecutor
@@ -201,7 +201,7 @@ func (rc *reconciler) reconcile() {
 					volumeToMount.Pod.UID)
 				err := rc.operationExecutor.VerifyControllerAttachedVolume(
 					volumeToMount.VolumeToMount,
-					rc.hostName,
+					rc.nodeName,
 					rc.actualStateOfWorld)
 				if err != nil &&
 					!nestedpendingoperations.IsAlreadyExists(err) &&
@@ -230,7 +230,7 @@ func (rc *reconciler) reconcile() {
 				volumeToAttach := operationexecutor.VolumeToAttach{
 					VolumeName: volumeToMount.VolumeName,
 					VolumeSpec: volumeToMount.VolumeSpec,
-					NodeName:   rc.hostName,
+					NodeName:   rc.nodeName,
 				}
 				glog.V(12).Infof("Attempting to start AttachVolume for volume %q (spec.Name: %q)  pod %q (UID: %q)",
 					volumeToMount.VolumeName,
@@ -334,7 +334,7 @@ func (rc *reconciler) reconcile() {
 					// Kubelet not responsible for detaching or this volume has a non-attachable volume plugin,
 					// so just remove it to actualStateOfWorld without attach.
 					rc.actualStateOfWorld.MarkVolumeAsDetached(
-						attachedVolume.VolumeName, rc.hostName)
+						attachedVolume.VolumeName, rc.nodeName)
 				} else {
 					// Only detach if kubelet detach is enabled
 					glog.V(12).Infof("Attempting to start DetachVolume for volume %q (spec.Name: %q)",

pkg/kubelet/volumemanager/reconciler/reconciler_test.go

@@ -29,6 +29,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/config"
 	"k8s.io/kubernetes/pkg/kubelet/volumemanager/cache"
 	"k8s.io/kubernetes/pkg/runtime"
+	k8stypes "k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/mount"
 	"k8s.io/kubernetes/pkg/util/sets"
 	"k8s.io/kubernetes/pkg/util/wait"
@@ -45,9 +46,9 @@ const (
 	reconcilerReconstructSleepPeriod time.Duration = 10 * time.Minute
 	// waitForAttachTimeout is the maximum amount of time a
 	// operationexecutor.Mount call will wait for a volume to be attached.
-	waitForAttachTimeout time.Duration = 1 * time.Second
-	nodeName             string        = "myhostname"
-	kubeletPodsDir       string        = "fake-dir"
+	waitForAttachTimeout time.Duration     = 1 * time.Second
+	nodeName             k8stypes.NodeName = k8stypes.NodeName("mynodename")
+	kubeletPodsDir       string            = "fake-dir"
 )
 
 // Calls Run()
@@ -452,7 +453,7 @@ func createTestClient() *fake.Clientset {
 	fakeClient.AddReactor("get", "nodes",
 		func(action core.Action) (bool, runtime.Object, error) {
 			return true, &api.Node{
-				ObjectMeta: api.ObjectMeta{Name: nodeName},
+				ObjectMeta: api.ObjectMeta{Name: string(nodeName)},
 				Status: api.NodeStatus{
 					VolumesAttached: []api.AttachedVolume{
 						{
@@ -460,7 +461,7 @@ func createTestClient() *fake.Clientset {
 							DevicePath: "fake/path",
 						},
 					}},
-				Spec: api.NodeSpec{ExternalID: nodeName},
+				Spec: api.NodeSpec{ExternalID: string(nodeName)},
 			}, nil
 		})
 	fakeClient.AddReactor("*", "*", func(action core.Action) (bool, runtime.Object, error) {

pkg/kubelet/volumemanager/volume_manager.go

@@ -33,6 +33,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/volumemanager/cache"
 	"k8s.io/kubernetes/pkg/kubelet/volumemanager/populator"
 	"k8s.io/kubernetes/pkg/kubelet/volumemanager/reconciler"
+	k8stypes "k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/mount"
 	"k8s.io/kubernetes/pkg/util/runtime"
 	"k8s.io/kubernetes/pkg/util/sets"
@@ -143,7 +144,7 @@ type VolumeManager interface {
 //   Must be pre-initialized.
 func NewVolumeManager(
 	controllerAttachDetachEnabled bool,
-	hostName string,
+	nodeName k8stypes.NodeName,
 	podManager pod.Manager,
 	kubeClient internalclientset.Interface,
 	volumePluginMgr *volume.VolumePluginMgr,
@@ -156,7 +157,7 @@ func NewVolumeManager(
 		kubeClient:          kubeClient,
 		volumePluginMgr:     volumePluginMgr,
 		desiredStateOfWorld: cache.NewDesiredStateOfWorld(volumePluginMgr),
-		actualStateOfWorld:  cache.NewActualStateOfWorld(hostName, volumePluginMgr),
+		actualStateOfWorld:  cache.NewActualStateOfWorld(nodeName, volumePluginMgr),
 		operationExecutor: operationexecutor.NewOperationExecutor(
 			kubeClient,
 			volumePluginMgr,
@@ -169,7 +170,7 @@ func NewVolumeManager(
 		reconcilerLoopSleepPeriod,
 		reconcilerReconstructSleepPeriod,
 		waitForAttachTimeout,
-		hostName,
+		nodeName,
 		vm.desiredStateOfWorld,
 		vm.actualStateOfWorld,
 		vm.operationExecutor,

pkg/types/nodename.go

+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package types
+
+// NodeName is a type that holds a api.Node's Name identifier.
+// Being a type captures intent and helps make sure that the node name
+// is not confused with similar concepts (the hostname, the cloud provider id,
+// the cloud provider name etc)
+//
+// To clarify the various types:
+//
+// * Node.Name is the Name field of the Node in the API.  This should be stored in a NodeName.
+//   Unfortunately, because Name is part of ObjectMeta, we can't store it as a NodeName at the API level.
+//
+// * Hostname is the hostname of the local machine (from uname -n).
+//   However, some components allow the user to pass in a --hostname-override flag,
+//   which will override this in most places. In the absence of anything more meaningful,
+//   kubelet will use Hostname as the Node.Name when it creates the Node.
+//
+// * The cloudproviders have the own names: GCE has InstanceName, AWS has InstanceId.
+//
+//   For GCE, InstanceName is the Name of an Instance object in the GCE API.  On GCE, Instance.Name becomes the
+//   Hostname, and thus it makes sense also to use it as the Node.Name.  But that is GCE specific, and it is up
+//   to the cloudprovider how to do this mapping.
+//
+//   For AWS, the InstanceID is not yet suitable for use as a Node.Name, so we actually use the
+//   PrivateDnsName for the Node.Name.  And this is _not_ always the same as the hostname: if
+//   we are using a custom DHCP domain it won't be.
+type NodeName string

pkg/util/node/node.go

@@ -28,6 +28,7 @@ import (
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 func GetHostname(hostnameOverride string) string {
@@ -86,7 +87,7 @@ func GetZoneKey(node *api.Node) string {
 }
 
 // SetNodeCondition updates specific node condition with patch operation.
-func SetNodeCondition(c clientset.Interface, node string, condition api.NodeCondition) error {
+func SetNodeCondition(c clientset.Interface, node types.NodeName, condition api.NodeCondition) error {
 	generatePatch := func(condition api.NodeCondition) ([]byte, error) {
 		raw, err := json.Marshal(&[]api.NodeCondition{condition})
 		if err != nil {
@@ -99,6 +100,6 @@ func SetNodeCondition(c clientset.Interface, node string, condition api.NodeCond
 	if err != nil {
 		return nil
 	}
-	_, err = c.Core().Nodes().PatchStatus(node, patch)
+	_, err = c.Core().Nodes().PatchStatus(string(node), patch)
 	return err
 }

pkg/volume/aws_ebs/attacher.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/cloudprovider/providers/aws"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/exec"
 	"k8s.io/kubernetes/pkg/util/mount"
 	"k8s.io/kubernetes/pkg/volume"
@@ -57,7 +58,7 @@ func (plugin *awsElasticBlockStorePlugin) GetDeviceMountRefs(deviceMountPath str
 	return mount.GetMountRefs(mounter, deviceMountPath)
 }
 
-func (attacher *awsElasticBlockStoreAttacher) Attach(spec *volume.Spec, hostName string) (string, error) {
+func (attacher *awsElasticBlockStoreAttacher) Attach(spec *volume.Spec, nodeName types.NodeName) (string, error) {
 	volumeSource, readOnly, err := getVolumeSource(spec)
 	if err != nil {
 		return "", err
@@ -67,7 +68,7 @@ func (attacher *awsElasticBlockStoreAttacher) Attach(spec *volume.Spec, hostName
 
 	// awsCloud.AttachDisk checks if disk is already attached to node and
 	// succeeds in that case, so no need to do that separately.
-	devicePath, err := attacher.awsVolumes.AttachDisk(volumeID, hostName, readOnly)
+	devicePath, err := attacher.awsVolumes.AttachDisk(volumeID, nodeName, readOnly)
 	if err != nil {
 		glog.Errorf("Error attaching volume %q: %+v", volumeID, err)
 		return "", err
@@ -185,24 +186,24 @@ func (plugin *awsElasticBlockStorePlugin) NewDetacher() (volume.Detacher, error)
 	}, nil
 }
 
-func (detacher *awsElasticBlockStoreDetacher) Detach(deviceMountPath string, hostName string) error {
+func (detacher *awsElasticBlockStoreDetacher) Detach(deviceMountPath string, nodeName types.NodeName) error {
 	volumeID := path.Base(deviceMountPath)
 
-	attached, err := detacher.awsVolumes.DiskIsAttached(volumeID, hostName)
+	attached, err := detacher.awsVolumes.DiskIsAttached(volumeID, nodeName)
 	if err != nil {
 		// Log error and continue with detach
 		glog.Errorf(
 			"Error checking if volume (%q) is already attached to current node (%q). Will continue and try detach anyway. err=%v",
-			volumeID, hostName, err)
+			volumeID, nodeName, err)
 	}
 
 	if err == nil && !attached {
 		// Volume is already detached from node.
-		glog.Infof("detach operation was successful. volume %q is already detached from node %q.", volumeID, hostName)
+		glog.Infof("detach operation was successful. volume %q is already detached from node %q.", volumeID, nodeName)
 		return nil
 	}
 
-	if _, err = detacher.awsVolumes.DetachDisk(volumeID, hostName); err != nil {
+	if _, err = detacher.awsVolumes.DetachDisk(volumeID, nodeName); err != nil {
 		glog.Errorf("Error detaching volumeID %q: %v", volumeID, err)
 		return err
 	}

pkg/volume/aws_ebs/attacher_test.go

@@ -26,6 +26,7 @@ import (
 	volumetest "k8s.io/kubernetes/pkg/volume/testing"
 
 	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 func TestGetDeviceName_Volume(t *testing.T) {
@@ -74,7 +75,7 @@ type testcase struct {
 
 func TestAttachDetach(t *testing.T) {
 	diskName := "disk"
-	instanceID := "instance"
+	nodeName := types.NodeName("instance")
 	readOnly := false
 	spec := createVolSpec(diskName, readOnly)
 	attachError := errors.New("Fake attach error")
@@ -84,10 +85,10 @@ func TestAttachDetach(t *testing.T) {
 		// Successful Attach call
 		{
 			name:   "Attach_Positive",
-			attach: attachCall{diskName, instanceID, readOnly, "/dev/sda", nil},
+			attach: attachCall{diskName, nodeName, readOnly, "/dev/sda", nil},
 			test: func(testcase *testcase) (string, error) {
 				attacher := newAttacher(testcase)
-				return attacher.Attach(spec, instanceID)
+				return attacher.Attach(spec, nodeName)
 			},
 			expectedDevice: "/dev/sda",
 		},
@@ -95,10 +96,10 @@ func TestAttachDetach(t *testing.T) {
 		// Attach call fails
 		{
 			name:   "Attach_Negative",
-			attach: attachCall{diskName, instanceID, readOnly, "", attachError},
+			attach: attachCall{diskName, nodeName, readOnly, "", attachError},
 			test: func(testcase *testcase) (string, error) {
 				attacher := newAttacher(testcase)
-				return attacher.Attach(spec, instanceID)
+				return attacher.Attach(spec, nodeName)
 			},
 			expectedError: attachError,
 		},
@@ -106,43 +107,43 @@ func TestAttachDetach(t *testing.T) {
 		// Detach succeeds
 		{
 			name:           "Detach_Positive",
-			diskIsAttached: diskIsAttachedCall{diskName, instanceID, true, nil},
-			detach:         detachCall{diskName, instanceID, "/dev/sda", nil},
+			diskIsAttached: diskIsAttachedCall{diskName, nodeName, true, nil},
+			detach:         detachCall{diskName, nodeName, "/dev/sda", nil},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, instanceID)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 		},
 
 		// Disk is already detached
 		{
 			name:           "Detach_Positive_AlreadyDetached",
-			diskIsAttached: diskIsAttachedCall{diskName, instanceID, false, nil},
+			diskIsAttached: diskIsAttachedCall{diskName, nodeName, false, nil},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, instanceID)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 		},
 
 		// Detach succeeds when DiskIsAttached fails
 		{
 			name:           "Detach_Positive_CheckFails",
-			diskIsAttached: diskIsAttachedCall{diskName, instanceID, false, diskCheckError},
-			detach:         detachCall{diskName, instanceID, "/dev/sda", nil},
+			diskIsAttached: diskIsAttachedCall{diskName, nodeName, false, diskCheckError},
+			detach:         detachCall{diskName, nodeName, "/dev/sda", nil},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, instanceID)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 		},
 
 		// Detach fails
 		{
 			name:           "Detach_Negative",
-			diskIsAttached: diskIsAttachedCall{diskName, instanceID, false, diskCheckError},
-			detach:         detachCall{diskName, instanceID, "", detachError},
+			diskIsAttached: diskIsAttachedCall{diskName, nodeName, false, diskCheckError},
+			detach:         detachCall{diskName, nodeName, "", detachError},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, instanceID)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 			expectedError: detachError,
 		},
@@ -216,7 +217,7 @@ func createPVSpec(name string, readOnly bool) *volume.Spec {
 
 type attachCall struct {
 	diskName      string
-	instanceID    string
+	nodeName      types.NodeName
 	readOnly      bool
 	retDeviceName string
 	ret           error
@@ -224,21 +225,22 @@ type attachCall struct {
 
 type detachCall struct {
 	diskName      string
-	instanceID    string
+	nodeName      types.NodeName
 	retDeviceName string
 	ret           error
 }
 
 type diskIsAttachedCall struct {
-	diskName, instanceID string
-	isAttached           bool
-	ret                  error
+	diskName   string
+	nodeName   types.NodeName
+	isAttached bool
+	ret        error
 }
 
-func (testcase *testcase) AttachDisk(diskName string, instanceID string, readOnly bool) (string, error) {
+func (testcase *testcase) AttachDisk(diskName string, nodeName types.NodeName, readOnly bool) (string, error) {
 	expected := &testcase.attach
 
-	if expected.diskName == "" && expected.instanceID == "" {
+	if expected.diskName == "" && expected.nodeName == "" {
 		// testcase.attach looks uninitialized, test did not expect to call
 		// AttachDisk
 		testcase.t.Errorf("Unexpected AttachDisk call!")
@@ -250,9 +252,9 @@ func (testcase *testcase) AttachDisk(diskName string, instanceID string, readOnl
 		return "", errors.New("Unexpected AttachDisk call: wrong diskName")
 	}
 
-	if expected.instanceID != instanceID {
-		testcase.t.Errorf("Unexpected AttachDisk call: expected instanceID %s, got %s", expected.instanceID, instanceID)
-		return "", errors.New("Unexpected AttachDisk call: wrong instanceID")
+	if expected.nodeName != nodeName {
+		testcase.t.Errorf("Unexpected AttachDisk call: expected nodeName %s, got %s", expected.nodeName, nodeName)
+		return "", errors.New("Unexpected AttachDisk call: wrong nodeName")
 	}
 
 	if expected.readOnly != readOnly {
@@ -260,15 +262,15 @@ func (testcase *testcase) AttachDisk(diskName string, instanceID string, readOnl
 		return "", errors.New("Unexpected AttachDisk call: wrong readOnly")
 	}
 
-	glog.V(4).Infof("AttachDisk call: %s, %s, %v, returning %q, %v", diskName, instanceID, readOnly, expected.retDeviceName, expected.ret)
+	glog.V(4).Infof("AttachDisk call: %s, %s, %v, returning %q, %v", diskName, nodeName, readOnly, expected.retDeviceName, expected.ret)
 
 	return expected.retDeviceName, expected.ret
 }
 
-func (testcase *testcase) DetachDisk(diskName string, instanceID string) (string, error) {
+func (testcase *testcase) DetachDisk(diskName string, nodeName types.NodeName) (string, error) {
 	expected := &testcase.detach
 
-	if expected.diskName == "" && expected.instanceID == "" {
+	if expected.diskName == "" && expected.nodeName == "" {
 		// testcase.detach looks uninitialized, test did not expect to call
 		// DetachDisk
 		testcase.t.Errorf("Unexpected DetachDisk call!")
@@ -280,20 +282,20 @@ func (testcase *testcase) DetachDisk(diskName string, instanceID string) (string
 		return "", errors.New("Unexpected DetachDisk call: wrong diskName")
 	}
 
-	if expected.instanceID != instanceID {
-		testcase.t.Errorf("Unexpected DetachDisk call: expected instanceID %s, got %s", expected.instanceID, instanceID)
-		return "", errors.New("Unexpected DetachDisk call: wrong instanceID")
+	if expected.nodeName != nodeName {
+		testcase.t.Errorf("Unexpected DetachDisk call: expected nodeName %s, got %s", expected.nodeName, nodeName)
+		return "", errors.New("Unexpected DetachDisk call: wrong nodeName")
 	}
 
-	glog.V(4).Infof("DetachDisk call: %s, %s, returning %q, %v", diskName, instanceID, expected.retDeviceName, expected.ret)
+	glog.V(4).Infof("DetachDisk call: %s, %s, returning %q, %v", diskName, nodeName, expected.retDeviceName, expected.ret)
 
 	return expected.retDeviceName, expected.ret
 }
 
-func (testcase *testcase) DiskIsAttached(diskName, instanceID string) (bool, error) {
+func (testcase *testcase) DiskIsAttached(diskName string, nodeName types.NodeName) (bool, error) {
 	expected := &testcase.diskIsAttached
 
-	if expected.diskName == "" && expected.instanceID == "" {
+	if expected.diskName == "" && expected.nodeName == "" {
 		// testcase.diskIsAttached looks uninitialized, test did not expect to
 		// call DiskIsAttached
 		testcase.t.Errorf("Unexpected DiskIsAttached call!")
@@ -305,12 +307,12 @@ func (testcase *testcase) DiskIsAttached(diskName, instanceID string) (bool, err
 		return false, errors.New("Unexpected DiskIsAttached call: wrong diskName")
 	}
 
-	if expected.instanceID != instanceID {
-		testcase.t.Errorf("Unexpected DiskIsAttached call: expected instanceID %s, got %s", expected.instanceID, instanceID)
-		return false, errors.New("Unexpected DiskIsAttached call: wrong instanceID")
+	if expected.nodeName != nodeName {
+		testcase.t.Errorf("Unexpected DiskIsAttached call: expected nodeName %s, got %s", expected.nodeName, nodeName)
+		return false, errors.New("Unexpected DiskIsAttached call: wrong nodeName")
 	}
 
-	glog.V(4).Infof("DiskIsAttached call: %s, %s, returning %v, %v", diskName, instanceID, expected.isAttached, expected.ret)
+	glog.V(4).Infof("DiskIsAttached call: %s, %s, returning %v, %v", diskName, nodeName, expected.isAttached, expected.ret)
 
 	return expected.isAttached, expected.ret
 }

pkg/volume/azure_dd/attacher.go

@@ -27,6 +27,7 @@ import (
 	"github.com/Azure/azure-sdk-for-go/arm/compute"
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/cloudprovider"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/exec"
 	"k8s.io/kubernetes/pkg/util/keymutex"
 	"k8s.io/kubernetes/pkg/util/mount"
@@ -65,23 +66,23 @@ func (plugin *azureDataDiskPlugin) NewAttacher() (volume.Attacher, error) {
 	}, nil
 }
 
-// Attach attaches a volume.Spec to a Azure VM referenced by hostname, returning the disk's LUN
-func (attacher *azureDiskAttacher) Attach(spec *volume.Spec, hostName string) (string, error) {
+// Attach attaches a volume.Spec to a Azure VM referenced by NodeName, returning the disk's LUN
+func (attacher *azureDiskAttacher) Attach(spec *volume.Spec, nodeName types.NodeName) (string, error) {
 	volumeSource, err := getVolumeSource(spec)
 	if err != nil {
 		glog.Warningf("failed to get azure disk spec")
 		return "", err
 	}
-	instanceid, err := attacher.azureProvider.InstanceID(hostName)
+	instanceid, err := attacher.azureProvider.InstanceID(nodeName)
 	if err != nil {
 		glog.Warningf("failed to get azure instance id")
-		return "", fmt.Errorf("failed to get azure instance id for host %q", hostName)
+		return "", fmt.Errorf("failed to get azure instance id for node %q", nodeName)
 	}
 	if ind := strings.LastIndex(instanceid, "/"); ind >= 0 {
 		instanceid = instanceid[(ind + 1):]
 	}
 
-	lun, err := attacher.azureProvider.GetDiskLun(volumeSource.DiskName, volumeSource.DataDiskURI, instanceid)
+	lun, err := attacher.azureProvider.GetDiskLun(volumeSource.DiskName, volumeSource.DataDiskURI, nodeName)
 	if err == cloudprovider.InstanceNotFound {
 		// Log error and continue with attach
 		glog.Warningf(
@@ -96,15 +97,15 @@ func (attacher *azureDiskAttacher) Attach(spec *volume.Spec, hostName string) (s
 		getLunMutex.LockKey(instanceid)
 		defer getLunMutex.UnlockKey(instanceid)
 
-		lun, err = attacher.azureProvider.GetNextDiskLun(instanceid)
+		lun, err = attacher.azureProvider.GetNextDiskLun(nodeName)
 		if err != nil {
-			glog.Warningf("no LUN available for instance %q", instanceid)
+			glog.Warningf("no LUN available for instance %q", nodeName)
 			return "", fmt.Errorf("all LUNs are used, cannot attach volume %q to instance %q", volumeSource.DiskName, instanceid)
 		}
 
-		err = attacher.azureProvider.AttachDisk(volumeSource.DiskName, volumeSource.DataDiskURI, instanceid, lun, compute.CachingTypes(*volumeSource.CachingMode))
+		err = attacher.azureProvider.AttachDisk(volumeSource.DiskName, volumeSource.DataDiskURI, nodeName, lun, compute.CachingTypes(*volumeSource.CachingMode))
 		if err == nil {
-			glog.V(4).Infof("Attach operation successful: volume %q attached to node %q.", volumeSource.DataDiskURI, instanceid)
+			glog.V(4).Infof("Attach operation successful: volume %q attached to node %q.", volumeSource.DataDiskURI, nodeName)
 		} else {
 			glog.V(2).Infof("Attach volume %q to instance %q failed with %v", volumeSource.DataDiskURI, instanceid, err)
 			return "", fmt.Errorf("Attach volume %q to instance %q failed with %v", volumeSource.DiskName, instanceid, err)
@@ -213,21 +214,21 @@ func (plugin *azureDataDiskPlugin) NewDetacher() (volume.Detacher, error) {
 }
 
 // Detach detaches disk from Azure VM.
-func (detacher *azureDiskDetacher) Detach(diskName string, hostName string) error {
+func (detacher *azureDiskDetacher) Detach(diskName string, nodeName types.NodeName) error {
 	if diskName == "" {
 		return fmt.Errorf("invalid disk to detach: %q", diskName)
 	}
-	instanceid, err := detacher.azureProvider.InstanceID(hostName)
+	instanceid, err := detacher.azureProvider.InstanceID(nodeName)
 	if err != nil {
-		glog.Warningf("no instance id for host %q, skip detaching", hostName)
+		glog.Warningf("no instance id for node %q, skip detaching", nodeName)
 		return nil
 	}
 	if ind := strings.LastIndex(instanceid, "/"); ind >= 0 {
 		instanceid = instanceid[(ind + 1):]
 	}
 
-	glog.V(4).Infof("detach %v from host %q", diskName, instanceid)
-	err = detacher.azureProvider.DetachDiskByName(diskName, "" /* diskURI */, instanceid)
+	glog.V(4).Infof("detach %v from node %q", diskName, nodeName)
+	err = detacher.azureProvider.DetachDiskByName(diskName, "" /* diskURI */, nodeName)
 	if err != nil {
 		glog.Errorf("failed to detach azure disk %q, err %v", diskName, err)
 	}

pkg/volume/azure_dd/azure_dd.go

@@ -50,15 +50,15 @@ type azureDataDiskPlugin struct {
 // azure cloud provider should implement it
 type azureCloudProvider interface {
 	// Attaches the disk to the host machine.
-	AttachDisk(diskName, diskUri, vmName string, lun int32, cachingMode compute.CachingTypes) error
+	AttachDisk(diskName, diskUri string, nodeName types.NodeName, lun int32, cachingMode compute.CachingTypes) error
 	// Detaches the disk, identified by disk name or uri, from the host machine.
-	DetachDiskByName(diskName, diskUri, vmName string) error
+	DetachDiskByName(diskName, diskUri string, nodeName types.NodeName) error
 	// Get the LUN number of the disk that is attached to the host
-	GetDiskLun(diskName, diskUri, vmName string) (int32, error)
+	GetDiskLun(diskName, diskUri string, nodeName types.NodeName) (int32, error)
 	// Get the next available LUN number to attach a new VHD
-	GetNextDiskLun(vmName string) (int32, error)
+	GetNextDiskLun(nodeName types.NodeName) (int32, error)
 	// InstanceID returns the cloud provider ID of the specified instance.
-	InstanceID(name string) (string, error)
+	InstanceID(nodeName types.NodeName) (string, error)
 }
 
 var _ volume.VolumePlugin = &azureDataDiskPlugin{}

pkg/volume/cinder/attacher.go

@@ -24,6 +24,7 @@ import (
 	"time"
 
 	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/exec"
 	"k8s.io/kubernetes/pkg/util/mount"
 	"k8s.io/kubernetes/pkg/volume"
@@ -59,7 +60,7 @@ func (plugin *cinderPlugin) GetDeviceMountRefs(deviceMountPath string) ([]string
 	return mount.GetMountRefs(mounter, deviceMountPath)
 }
 
-func (attacher *cinderDiskAttacher) Attach(spec *volume.Spec, hostName string) (string, error) {
+func (attacher *cinderDiskAttacher) Attach(spec *volume.Spec, nodeName types.NodeName) (string, error) {
 	volumeSource, _, err := getVolumeSource(spec)
 	if err != nil {
 		return "", err
@@ -71,7 +72,7 @@ func (attacher *cinderDiskAttacher) Attach(spec *volume.Spec, hostName string) (
 	if !res {
 		return "", fmt.Errorf("failed to list openstack instances")
 	}
-	instanceid, err := instances.InstanceID(hostName)
+	instanceid, err := instances.InstanceID(nodeName)
 	if err != nil {
 		return "", err
 	}
@@ -208,13 +209,13 @@ func (plugin *cinderPlugin) NewDetacher() (volume.Detacher, error) {
 	}, nil
 }
 
-func (detacher *cinderDiskDetacher) Detach(deviceMountPath string, hostName string) error {
+func (detacher *cinderDiskDetacher) Detach(deviceMountPath string, nodeName types.NodeName) error {
 	volumeID := path.Base(deviceMountPath)
 	instances, res := detacher.cinderProvider.Instances()
 	if !res {
 		return fmt.Errorf("failed to list openstack instances")
 	}
-	instanceid, err := instances.InstanceID(hostName)
+	instanceid, err := instances.InstanceID(nodeName)
 	if ind := strings.LastIndex(instanceid, "/"); ind >= 0 {
 		instanceid = instanceid[(ind + 1):]
 	}
@@ -224,12 +225,12 @@ func (detacher *cinderDiskDetacher) Detach(deviceMountPath string, hostName stri
 		// Log error and continue with detach
 		glog.Errorf(
 			"Error checking if volume (%q) is already attached to current node (%q). Will continue and try detach anyway. err=%v",
-			volumeID, hostName, err)
+			volumeID, nodeName, err)
 	}
 
 	if err == nil && !attached {
 		// Volume is already detached from node.
-		glog.Infof("detach operation was successful. volume %q is already detached from node %q.", volumeID, hostName)
+		glog.Infof("detach operation was successful. volume %q is already detached from node %q.", volumeID, nodeName)
 		return nil
 	}
 

pkg/volume/cinder/attacher_test.go

@@ -26,6 +26,7 @@ import (
 	volumetest "k8s.io/kubernetes/pkg/volume/testing"
 
 	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 func TestGetDeviceName_Volume(t *testing.T) {
@@ -77,6 +78,7 @@ type testcase struct {
 func TestAttachDetach(t *testing.T) {
 	diskName := "disk"
 	instanceID := "instance"
+	nodeName := types.NodeName(instanceID)
 	readOnly := false
 	spec := createVolSpec(diskName, readOnly)
 	attachError := errors.New("Fake attach error")
@@ -93,7 +95,7 @@ func TestAttachDetach(t *testing.T) {
 			diskPath:       diskPathCall{diskName, instanceID, "/dev/sda", nil},
 			test: func(testcase *testcase) (string, error) {
 				attacher := newAttacher(testcase)
-				return attacher.Attach(spec, instanceID)
+				return attacher.Attach(spec, nodeName)
 			},
 			expectedDevice: "/dev/sda",
 		},
@@ -106,7 +108,7 @@ func TestAttachDetach(t *testing.T) {
 			diskPath:       diskPathCall{diskName, instanceID, "/dev/sda", nil},
 			test: func(testcase *testcase) (string, error) {
 				attacher := newAttacher(testcase)
-				return attacher.Attach(spec, instanceID)
+				return attacher.Attach(spec, nodeName)
 			},
 			expectedDevice: "/dev/sda",
 		},
@@ -120,7 +122,7 @@ func TestAttachDetach(t *testing.T) {
 			diskPath:       diskPathCall{diskName, instanceID, "/dev/sda", nil},
 			test: func(testcase *testcase) (string, error) {
 				attacher := newAttacher(testcase)
-				return attacher.Attach(spec, instanceID)
+				return attacher.Attach(spec, nodeName)
 			},
 			expectedDevice: "/dev/sda",
 		},
@@ -133,7 +135,7 @@ func TestAttachDetach(t *testing.T) {
 			attach:         attachCall{diskName, instanceID, "/dev/sda", attachError},
 			test: func(testcase *testcase) (string, error) {
 				attacher := newAttacher(testcase)
-				return attacher.Attach(spec, instanceID)
+				return attacher.Attach(spec, nodeName)
 			},
 			expectedError: attachError,
 		},
@@ -147,7 +149,7 @@ func TestAttachDetach(t *testing.T) {
 			diskPath:       diskPathCall{diskName, instanceID, "", diskPathError},
 			test: func(testcase *testcase) (string, error) {
 				attacher := newAttacher(testcase)
-				return attacher.Attach(spec, instanceID)
+				return attacher.Attach(spec, nodeName)
 			},
 			expectedError: diskPathError,
 		},
@@ -160,7 +162,7 @@ func TestAttachDetach(t *testing.T) {
 			detach:         detachCall{diskName, instanceID, nil},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, instanceID)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 		},
 
@@ -171,7 +173,7 @@ func TestAttachDetach(t *testing.T) {
 			diskIsAttached: diskIsAttachedCall{diskName, instanceID, false, nil},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, instanceID)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 		},
 
@@ -183,7 +185,7 @@ func TestAttachDetach(t *testing.T) {
 			detach:         detachCall{diskName, instanceID, nil},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, instanceID)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 		},
 
@@ -195,7 +197,7 @@ func TestAttachDetach(t *testing.T) {
 			detach:         detachCall{diskName, instanceID, detachError},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, instanceID)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 			expectedError: detachError,
 		},
@@ -420,30 +422,30 @@ type instances struct {
 	instanceID string
 }
 
-func (instances *instances) NodeAddresses(name string) ([]api.NodeAddress, error) {
+func (instances *instances) NodeAddresses(name types.NodeName) ([]api.NodeAddress, error) {
 	return []api.NodeAddress{}, errors.New("Not implemented")
 }
 
-func (instances *instances) ExternalID(name string) (string, error) {
+func (instances *instances) ExternalID(name types.NodeName) (string, error) {
 	return "", errors.New("Not implemented")
 }
 
-func (instances *instances) InstanceID(name string) (string, error) {
+func (instances *instances) InstanceID(name types.NodeName) (string, error) {
 	return instances.instanceID, nil
 }
 
-func (instances *instances) InstanceType(name string) (string, error) {
+func (instances *instances) InstanceType(name types.NodeName) (string, error) {
 	return "", errors.New("Not implemented")
 }
 
-func (instances *instances) List(filter string) ([]string, error) {
-	return []string{}, errors.New("Not implemented")
+func (instances *instances) List(filter string) ([]types.NodeName, error) {
+	return []types.NodeName{}, errors.New("Not implemented")
 }
 
 func (instances *instances) AddSSHKeyToAllInstances(user string, keyData []byte) error {
 	return errors.New("Not implemented")
 }
 
-func (instances *instances) CurrentNodeName(hostname string) (string, error) {
+func (instances *instances) CurrentNodeName(hostname string) (types.NodeName, error) {
 	return "", errors.New("Not implemented")
 }

pkg/volume/gce_pd/attacher.go

@@ -26,6 +26,7 @@ import (
 
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/cloudprovider/providers/gce"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/exec"
 	"k8s.io/kubernetes/pkg/util/mount"
 	"k8s.io/kubernetes/pkg/util/sets"
@@ -60,13 +61,13 @@ func (plugin *gcePersistentDiskPlugin) GetDeviceMountRefs(deviceMountPath string
 }
 
 // Attach checks with the GCE cloud provider if the specified volume is already
-// attached to the specified node. If the volume is attached, it succeeds
-// (returns nil). If it is not, Attach issues a call to the GCE cloud provider
-// to attach it.
-// Callers are responsible for retryinging on failure.
+// attached to the node with the specified Name.
+// If the volume is attached, it succeeds (returns nil).
+// If it is not, Attach issues a call to the GCE cloud provider to attach it.
+// Callers are responsible for retrying on failure.
 // Callers are responsible for thread safety between concurrent attach and
 // detach operations.
-func (attacher *gcePersistentDiskAttacher) Attach(spec *volume.Spec, hostName string) (string, error) {
+func (attacher *gcePersistentDiskAttacher) Attach(spec *volume.Spec, nodeName types.NodeName) (string, error) {
 	volumeSource, readOnly, err := getVolumeSource(spec)
 	if err != nil {
 		return "", err
@@ -74,20 +75,20 @@ func (attacher *gcePersistentDiskAttacher) Attach(spec *volume.Spec, hostName st
 
 	pdName := volumeSource.PDName
 
-	attached, err := attacher.gceDisks.DiskIsAttached(pdName, hostName)
+	attached, err := attacher.gceDisks.DiskIsAttached(pdName, nodeName)
 	if err != nil {
 		// Log error and continue with attach
 		glog.Errorf(
 			"Error checking if PD (%q) is already attached to current node (%q). Will continue and try attach anyway. err=%v",
-			pdName, hostName, err)
+			pdName, nodeName, err)
 	}
 
 	if err == nil && attached {
 		// Volume is already attached to node.
-		glog.Infof("Attach operation is successful. PD %q is already attached to node %q.", pdName, hostName)
+		glog.Infof("Attach operation is successful. PD %q is already attached to node %q.", pdName, nodeName)
 	} else {
-		if err := attacher.gceDisks.AttachDisk(pdName, hostName, readOnly); err != nil {
-			glog.Errorf("Error attaching PD %q to node %q: %+v", pdName, hostName, err)
+		if err := attacher.gceDisks.AttachDisk(pdName, nodeName, readOnly); err != nil {
+			glog.Errorf("Error attaching PD %q to node %q: %+v", pdName, nodeName, err)
 			return "", err
 		}
 	}
@@ -210,25 +211,25 @@ func (plugin *gcePersistentDiskPlugin) NewDetacher() (volume.Detacher, error) {
 // Callers are responsible for retryinging on failure.
 // Callers are responsible for thread safety between concurrent attach and detach
 // operations.
-func (detacher *gcePersistentDiskDetacher) Detach(deviceMountPath string, hostName string) error {
+func (detacher *gcePersistentDiskDetacher) Detach(deviceMountPath string, nodeName types.NodeName) error {
 	pdName := path.Base(deviceMountPath)
 
-	attached, err := detacher.gceDisks.DiskIsAttached(pdName, hostName)
+	attached, err := detacher.gceDisks.DiskIsAttached(pdName, nodeName)
 	if err != nil {
 		// Log error and continue with detach
 		glog.Errorf(
 			"Error checking if PD (%q) is already attached to current node (%q). Will continue and try detach anyway. err=%v",
-			pdName, hostName, err)
+			pdName, nodeName, err)
 	}
 
 	if err == nil && !attached {
 		// Volume is not attached to node. Success!
-		glog.Infof("Detach operation is successful. PD %q was not attached to node %q.", pdName, hostName)
+		glog.Infof("Detach operation is successful. PD %q was not attached to node %q.", pdName, nodeName)
 		return nil
 	}
 
-	if err = detacher.gceDisks.DetachDisk(pdName, hostName); err != nil {
-		glog.Errorf("Error detaching PD %q from node %q: %v", pdName, hostName, err)
+	if err = detacher.gceDisks.DetachDisk(pdName, nodeName); err != nil {
+		glog.Errorf("Error detaching PD %q from node %q: %v", pdName, nodeName, err)
 		return err
 	}
 

pkg/volume/testing/testing.go

@@ -370,7 +370,7 @@ func (fv *FakeVolume) TearDownAt(dir string) error {
 	return os.RemoveAll(dir)
 }
 
-func (fv *FakeVolume) Attach(spec *Spec, hostName string) (string, error) {
+func (fv *FakeVolume) Attach(spec *Spec, nodeName types.NodeName) (string, error) {
 	fv.Lock()
 	defer fv.Unlock()
 	fv.AttachCallCount++
@@ -416,7 +416,7 @@ func (fv *FakeVolume) GetMountDeviceCallCount() int {
 	return fv.MountDeviceCallCount
 }
 
-func (fv *FakeVolume) Detach(deviceMountPath string, hostName string) error {
+func (fv *FakeVolume) Detach(deviceMountPath string, nodeName types.NodeName) error {
 	fv.Lock()
 	defer fv.Unlock()
 	fv.DetachCallCount++

pkg/volume/util/operationexecutor/operation_executor.go

@@ -101,7 +101,7 @@ type OperationExecutor interface {
 	// If the volume is not found or there is an error (fetching the node
 	// object, for example) then an error is returned which triggers exponential
 	// back off on retries.
-	VerifyControllerAttachedVolume(volumeToMount VolumeToMount, nodeName string, actualStateOfWorld ActualStateOfWorldAttacherUpdater) error
+	VerifyControllerAttachedVolume(volumeToMount VolumeToMount, nodeName types.NodeName, actualStateOfWorld ActualStateOfWorldAttacherUpdater) error
 
 	// IsOperationPending returns true if an operation for the given volumeName and podName is pending,
 	// otherwise it returns false
@@ -149,18 +149,18 @@ type ActualStateOfWorldAttacherUpdater interface {
 	// TODO: in the future, we should be able to remove the volumeName
 	// argument to this method -- since it is used only for attachable
 	// volumes.  See issue 29695.
-	MarkVolumeAsAttached(volumeName api.UniqueVolumeName, volumeSpec *volume.Spec, nodeName, devicePath string) error
+	MarkVolumeAsAttached(volumeName api.UniqueVolumeName, volumeSpec *volume.Spec, nodeName types.NodeName, devicePath string) error
 
 	// Marks the specified volume as detached from the specified node
-	MarkVolumeAsDetached(volumeName api.UniqueVolumeName, nodeName string)
+	MarkVolumeAsDetached(volumeName api.UniqueVolumeName, nodeName types.NodeName)
 
 	// Marks desire to detach the specified volume (remove the volume from the node's
 	// volumesToReportedAsAttached list)
-	RemoveVolumeFromReportAsAttached(volumeName api.UniqueVolumeName, nodeName string) error
+	RemoveVolumeFromReportAsAttached(volumeName api.UniqueVolumeName, nodeName types.NodeName) error
 
 	// Unmarks the desire to detach for the specified volume (add the volume back to
 	// the node's volumesToReportedAsAttached list)
-	AddVolumeToReportAsAttached(volumeName api.UniqueVolumeName, nodeName string)
+	AddVolumeToReportAsAttached(volumeName api.UniqueVolumeName, nodeName types.NodeName)
 }
 
 // VolumeToAttach represents a volume that should be attached to a node.
@@ -175,7 +175,7 @@ type VolumeToAttach struct {
 
 	// NodeName is the identifier for the node that the volume should be
 	// attached to.
-	NodeName string
+	NodeName types.NodeName
 
 	// scheduledPods is a map containing the set of pods that reference this
 	// volume and are scheduled to the underlying node. The key in the map is
@@ -234,7 +234,7 @@ type AttachedVolume struct {
 	VolumeSpec *volume.Spec
 
 	// NodeName is the identifier for the node that the volume is attached to.
-	NodeName string
+	NodeName types.NodeName
 
 	// PluginIsAttachable indicates that the plugin for this volume implements
 	// the volume.Attacher interface
@@ -453,7 +453,7 @@ func (oe *operationExecutor) UnmountDevice(
 
 func (oe *operationExecutor) VerifyControllerAttachedVolume(
 	volumeToMount VolumeToMount,
-	nodeName string,
+	nodeName types.NodeName,
 	actualStateOfWorld ActualStateOfWorldAttacherUpdater) error {
 	verifyControllerAttachedVolumeFunc, err :=
 		oe.generateVerifyControllerAttachedVolumeFunc(volumeToMount, nodeName, actualStateOfWorld)
@@ -605,7 +605,7 @@ func (oe *operationExecutor) generateDetachVolumeFunc(
 func (oe *operationExecutor) verifyVolumeIsSafeToDetach(
 	volumeToDetach AttachedVolume) error {
 	// Fetch current node object
-	node, fetchErr := oe.kubeClient.Core().Nodes().Get(volumeToDetach.NodeName)
+	node, fetchErr := oe.kubeClient.Core().Nodes().Get(string(volumeToDetach.NodeName))
 	if fetchErr != nil {
 		if errors.IsNotFound(fetchErr) {
 			glog.Warningf("Node %q not found on API server. DetachVolume will skip safe to detach check.",
@@ -1001,7 +1001,7 @@ func (oe *operationExecutor) generateUnmountDeviceFunc(
 
 func (oe *operationExecutor) generateVerifyControllerAttachedVolumeFunc(
 	volumeToMount VolumeToMount,
-	nodeName string,
+	nodeName types.NodeName,
 	actualStateOfWorld ActualStateOfWorldAttacherUpdater) (func() error, error) {
 	return func() error {
 		if !volumeToMount.PluginIsAttachable {
@@ -1040,7 +1040,7 @@ func (oe *operationExecutor) generateVerifyControllerAttachedVolumeFunc(
 		}
 
 		// Fetch current node object
-		node, fetchErr := oe.kubeClient.Core().Nodes().Get(nodeName)
+		node, fetchErr := oe.kubeClient.Core().Nodes().Get(string(nodeName))
 		if fetchErr != nil {
 			// On failure, return error. Caller will log and retry.
 			return fmt.Errorf(

pkg/volume/volume.go

@@ -24,6 +24,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/resource"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 // Volume represents a directory used by pods or hosts on a node. All method
@@ -140,10 +141,10 @@ type Deleter interface {
 
 // Attacher can attach a volume to a node.
 type Attacher interface {
-	// Attaches the volume specified by the given spec to the given host.
+	// Attaches the volume specified by the given spec to the node with the given Name.
 	// On success, returns the device path where the device was attached on the
 	// node.
-	Attach(spec *Spec, hostName string) (string, error)
+	Attach(spec *Spec, nodeName types.NodeName) (string, error)
 
 	// WaitForAttach blocks until the device is attached to this
 	// node. If it successfully attaches, the path to the device
@@ -163,8 +164,8 @@ type Attacher interface {
 
 // Detacher can detach a volume from a node.
 type Detacher interface {
-	// Detach the given device from the given host.
-	Detach(deviceName, hostName string) error
+	// Detach the given device from the node with the given Name.
+	Detach(deviceName string, nodeName types.NodeName) error
 
 	// WaitForDetach blocks until the device is detached from this
 	// node. If the device does not detach within the given timeout

pkg/volume/vsphere_volume/attacher.go

@@ -24,6 +24,7 @@ import (
 
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/cloudprovider/providers/vsphere"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/exec"
 	"k8s.io/kubernetes/pkg/util/keymutex"
 	"k8s.io/kubernetes/pkg/util/mount"
@@ -60,21 +61,21 @@ func (plugin *vsphereVolumePlugin) NewAttacher() (volume.Attacher, error) {
 // Callers are responsible for retryinging on failure.
 // Callers are responsible for thread safety between concurrent attach and
 // detach operations.
-func (attacher *vsphereVMDKAttacher) Attach(spec *volume.Spec, hostName string) (string, error) {
+func (attacher *vsphereVMDKAttacher) Attach(spec *volume.Spec, nodeName types.NodeName) (string, error) {
 	volumeSource, _, err := getVolumeSource(spec)
 	if err != nil {
 		return "", err
 	}
 
-	glog.V(4).Infof("vSphere: Attach disk called for host %s", hostName)
+	glog.V(4).Infof("vSphere: Attach disk called for node %s", nodeName)
 
 	// Keeps concurrent attach operations to same host atomic
-	attachdetachMutex.LockKey(hostName)
-	defer attachdetachMutex.UnlockKey(hostName)
+	attachdetachMutex.LockKey(string(nodeName))
+	defer attachdetachMutex.UnlockKey(string(nodeName))
 
 	// vsphereCloud.AttachDisk checks if disk is already attached to host and
 	// succeeds in that case, so no need to do that separately.
-	_, diskUUID, err := attacher.vsphereVolumes.AttachDisk(volumeSource.VolumePath, hostName)
+	_, diskUUID, err := attacher.vsphereVolumes.AttachDisk(volumeSource.VolumePath, nodeName)
 	if err != nil {
 		glog.Errorf("Error attaching volume %q: %+v", volumeSource.VolumePath, err)
 		return "", err
@@ -190,27 +191,27 @@ func (plugin *vsphereVolumePlugin) NewDetacher() (volume.Detacher, error) {
 	}, nil
 }
 
-// Detach the given device from the given host.
-func (detacher *vsphereVMDKDetacher) Detach(deviceMountPath string, hostName string) error {
+// Detach the given device from the given node.
+func (detacher *vsphereVMDKDetacher) Detach(deviceMountPath string, nodeName types.NodeName) error {
 
 	volPath := getVolPathfromDeviceMountPath(deviceMountPath)
-	attached, err := detacher.vsphereVolumes.DiskIsAttached(volPath, hostName)
+	attached, err := detacher.vsphereVolumes.DiskIsAttached(volPath, nodeName)
 	if err != nil {
 		// Log error and continue with detach
 		glog.Errorf(
 			"Error checking if volume (%q) is already attached to current node (%q). Will continue and try detach anyway. err=%v",
-			volPath, hostName, err)
+			volPath, nodeName, err)
 	}
 
 	if err == nil && !attached {
 		// Volume is already detached from node.
-		glog.Infof("detach operation was successful. volume %q is already detached from node %q.", volPath, hostName)
+		glog.Infof("detach operation was successful. volume %q is already detached from node %q.", volPath, nodeName)
 		return nil
 	}
 
-	attachdetachMutex.LockKey(hostName)
-	defer attachdetachMutex.UnlockKey(hostName)
-	if err := detacher.vsphereVolumes.DetachDisk(volPath, hostName); err != nil {
+	attachdetachMutex.LockKey(string(nodeName))
+	defer attachdetachMutex.UnlockKey(string(nodeName))
+	if err := detacher.vsphereVolumes.DetachDisk(volPath, nodeName); err != nil {
 		glog.Errorf("Error detaching volume %q: %v", volPath, err)
 		return err
 	}

pkg/volume/vsphere_volume/attacher_test.go

@@ -26,6 +26,7 @@ import (
 	volumetest "k8s.io/kubernetes/pkg/volume/testing"
 
 	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 func TestGetDeviceName_Volume(t *testing.T) {
@@ -75,7 +76,7 @@ type testcase struct {
 func TestAttachDetach(t *testing.T) {
 	uuid := "00000000000000"
 	diskName := "[local] volumes/test"
-	hostName := "host"
+	nodeName := types.NodeName("host")
 	spec := createVolSpec(diskName)
 	attachError := errors.New("Fake attach error")
 	detachError := errors.New("Fake detach error")
@@ -84,10 +85,10 @@ func TestAttachDetach(t *testing.T) {
 		// Successful Attach call
 		{
 			name:   "Attach_Positive",
-			attach: attachCall{diskName, hostName, uuid, nil},
+			attach: attachCall{diskName, nodeName, uuid, nil},
 			test: func(testcase *testcase) (string, error) {
 				attacher := newAttacher(testcase)
-				return attacher.Attach(spec, hostName)
+				return attacher.Attach(spec, nodeName)
 			},
 			expectedDevice: "/dev/disk/by-id/wwn-0x" + uuid,
 		},
@@ -95,10 +96,10 @@ func TestAttachDetach(t *testing.T) {
 		// Attach call fails
 		{
 			name:   "Attach_Negative",
-			attach: attachCall{diskName, hostName, "", attachError},
+			attach: attachCall{diskName, nodeName, "", attachError},
 			test: func(testcase *testcase) (string, error) {
 				attacher := newAttacher(testcase)
-				return attacher.Attach(spec, hostName)
+				return attacher.Attach(spec, nodeName)
 			},
 			expectedError: attachError,
 		},
@@ -106,43 +107,43 @@ func TestAttachDetach(t *testing.T) {
 		// Detach succeeds
 		{
 			name:           "Detach_Positive",
-			diskIsAttached: diskIsAttachedCall{diskName, hostName, true, nil},
-			detach:         detachCall{diskName, hostName, nil},
+			diskIsAttached: diskIsAttachedCall{diskName, nodeName, true, nil},
+			detach:         detachCall{diskName, nodeName, nil},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, hostName)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 		},
 
 		// Disk is already detached
 		{
 			name:           "Detach_Positive_AlreadyDetached",
-			diskIsAttached: diskIsAttachedCall{diskName, hostName, false, nil},
+			diskIsAttached: diskIsAttachedCall{diskName, nodeName, false, nil},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, hostName)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 		},
 
 		// Detach succeeds when DiskIsAttached fails
 		{
 			name:           "Detach_Positive_CheckFails",
-			diskIsAttached: diskIsAttachedCall{diskName, hostName, false, diskCheckError},
-			detach:         detachCall{diskName, hostName, nil},
+			diskIsAttached: diskIsAttachedCall{diskName, nodeName, false, diskCheckError},
+			detach:         detachCall{diskName, nodeName, nil},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, hostName)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 		},
 
 		// Detach fails
 		{
 			name:           "Detach_Negative",
-			diskIsAttached: diskIsAttachedCall{diskName, hostName, false, diskCheckError},
-			detach:         detachCall{diskName, hostName, detachError},
+			diskIsAttached: diskIsAttachedCall{diskName, nodeName, false, diskCheckError},
+			detach:         detachCall{diskName, nodeName, detachError},
 			test: func(testcase *testcase) (string, error) {
 				detacher := newDetacher(testcase)
-				return "", detacher.Detach(diskName, hostName)
+				return "", detacher.Detach(diskName, nodeName)
 			},
 			expectedError: detachError,
 		},
@@ -214,27 +215,28 @@ func createPVSpec(name string) *volume.Spec {
 
 type attachCall struct {
 	diskName      string
-	hostName      string
+	nodeName      types.NodeName
 	retDeviceUUID string
 	ret           error
 }
 
 type detachCall struct {
 	diskName string
-	hostName string
+	nodeName types.NodeName
 	ret      error
 }
 
 type diskIsAttachedCall struct {
-	diskName, hostName string
-	isAttached         bool
-	ret                error
+	diskName   string
+	nodeName   types.NodeName
+	isAttached bool
+	ret        error
 }
 
-func (testcase *testcase) AttachDisk(diskName string, hostName string) (string, string, error) {
+func (testcase *testcase) AttachDisk(diskName string, nodeName types.NodeName) (string, string, error) {
 	expected := &testcase.attach
 
-	if expected.diskName == "" && expected.hostName == "" {
+	if expected.diskName == "" && expected.nodeName == "" {
 		// testcase.attach looks uninitialized, test did not expect to call
 		// AttachDisk
 		testcase.t.Errorf("Unexpected AttachDisk call!")
@@ -246,20 +248,20 @@ func (testcase *testcase) AttachDisk(diskName string, hostName string) (string,
 		return "", "", errors.New("Unexpected AttachDisk call: wrong diskName")
 	}
 
-	if expected.hostName != hostName {
-		testcase.t.Errorf("Unexpected AttachDisk call: expected hostName %s, got %s", expected.hostName, hostName)
-		return "", "", errors.New("Unexpected AttachDisk call: wrong hostName")
+	if expected.nodeName != nodeName {
+		testcase.t.Errorf("Unexpected AttachDisk call: expected nodeName %s, got %s", expected.nodeName, nodeName)
+		return "", "", errors.New("Unexpected AttachDisk call: wrong nodeName")
 	}
 
-	glog.V(4).Infof("AttachDisk call: %s, %s, returning %q, %v", diskName, hostName, expected.retDeviceUUID, expected.ret)
+	glog.V(4).Infof("AttachDisk call: %s, %s, returning %q, %v", diskName, nodeName, expected.retDeviceUUID, expected.ret)
 
 	return "", expected.retDeviceUUID, expected.ret
 }
 
-func (testcase *testcase) DetachDisk(diskName string, hostName string) error {
+func (testcase *testcase) DetachDisk(diskName string, nodeName types.NodeName) error {
 	expected := &testcase.detach
 
-	if expected.diskName == "" && expected.hostName == "" {
+	if expected.diskName == "" && expected.nodeName == "" {
 		// testcase.detach looks uninitialized, test did not expect to call
 		// DetachDisk
 		testcase.t.Errorf("Unexpected DetachDisk call!")
@@ -271,20 +273,20 @@ func (testcase *testcase) DetachDisk(diskName string, hostName string) error {
 		return errors.New("Unexpected DetachDisk call: wrong diskName")
 	}
 
-	if expected.hostName != hostName {
-		testcase.t.Errorf("Unexpected DetachDisk call: expected hostname %s, got %s", expected.hostName, hostName)
-		return errors.New("Unexpected DetachDisk call: wrong hostname")
+	if expected.nodeName != nodeName {
+		testcase.t.Errorf("Unexpected DetachDisk call: expected nodeName %s, got %s", expected.nodeName, nodeName)
+		return errors.New("Unexpected DetachDisk call: wrong nodeName")
 	}
 
-	glog.V(4).Infof("DetachDisk call: %s, %s, returning %v", diskName, hostName, expected.ret)
+	glog.V(4).Infof("DetachDisk call: %s, %s, returning %v", diskName, nodeName, expected.ret)
 
 	return expected.ret
 }
 
-func (testcase *testcase) DiskIsAttached(diskName, hostName string) (bool, error) {
+func (testcase *testcase) DiskIsAttached(diskName string, nodeName types.NodeName) (bool, error) {
 	expected := &testcase.diskIsAttached
 
-	if expected.diskName == "" && expected.hostName == "" {
+	if expected.diskName == "" && expected.nodeName == "" {
 		// testcase.diskIsAttached looks uninitialized, test did not expect to
 		// call DiskIsAttached
 		testcase.t.Errorf("Unexpected DiskIsAttached call!")
@@ -296,12 +298,12 @@ func (testcase *testcase) DiskIsAttached(diskName, hostName string) (bool, error
 		return false, errors.New("Unexpected DiskIsAttached call: wrong diskName")
 	}
 
-	if expected.hostName != hostName {
-		testcase.t.Errorf("Unexpected DiskIsAttached call: expected hostName %s, got %s", expected.hostName, hostName)
-		return false, errors.New("Unexpected DiskIsAttached call: wrong hostName")
+	if expected.nodeName != nodeName {
+		testcase.t.Errorf("Unexpected DiskIsAttached call: expected nodeName %s, got %s", expected.nodeName, nodeName)
+		return false, errors.New("Unexpected DiskIsAttached call: wrong nodeName")
 	}
 
-	glog.V(4).Infof("DiskIsAttached call: %s, %s, returning %v, %v", diskName, hostName, expected.isAttached, expected.ret)
+	glog.V(4).Infof("DiskIsAttached call: %s, %s, returning %v, %v", diskName, nodeName, expected.isAttached, expected.ret)
 
 	return expected.isAttached, expected.ret
 }

plugin/pkg/admission/persistentvolume/label/admission_test.go

@@ -24,6 +24,7 @@ import (
 	"k8s.io/kubernetes/pkg/admission"
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/cloudprovider/providers/aws"
+	"k8s.io/kubernetes/pkg/types"
 )
 
 type mockVolumes struct {
@@ -33,11 +34,11 @@ type mockVolumes struct {
 
 var _ aws.Volumes = &mockVolumes{}
 
-func (v *mockVolumes) AttachDisk(diskName string, instanceName string, readOnly bool) (string, error) {
+func (v *mockVolumes) AttachDisk(diskName string, nodeName types.NodeName, readOnly bool) (string, error) {
 	return "", fmt.Errorf("not implemented")
 }
 
-func (v *mockVolumes) DetachDisk(diskName string, instanceName string) (string, error) {
+func (v *mockVolumes) DetachDisk(diskName string, nodeName types.NodeName) (string, error) {
 	return "", fmt.Errorf("not implemented")
 }
 
@@ -57,7 +58,7 @@ func (c *mockVolumes) GetDiskPath(volumeName string) (string, error) {
 	return "", fmt.Errorf("not implemented")
 }
 
-func (c *mockVolumes) DiskIsAttached(volumeName, instanceID string) (bool, error) {
+func (c *mockVolumes) DiskIsAttached(volumeName string, nodeName types.NodeName) (bool, error) {
 	return false, fmt.Errorf("not implemented")
 }
 

test/e2e/pd.go

@@ -37,6 +37,7 @@ import (
 	client "k8s.io/kubernetes/pkg/client/unversioned"
 	awscloud "k8s.io/kubernetes/pkg/cloudprovider/providers/aws"
 	gcecloud "k8s.io/kubernetes/pkg/cloudprovider/providers/gce"
+	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/uuid"
 	"k8s.io/kubernetes/test/e2e/framework"
 )
@@ -54,8 +55,8 @@ var _ = framework.KubeDescribe("Pod Disks", func() {
 	var (
 		podClient  client.PodInterface
 		nodeClient client.NodeInterface
-		host0Name  string
-		host1Name  string
+		host0Name  types.NodeName
+		host1Name  types.NodeName
 	)
 	f := framework.NewDefaultFramework("pod-disks")
 
@@ -68,8 +69,8 @@ var _ = framework.KubeDescribe("Pod Disks", func() {
 
 		Expect(len(nodes.Items)).To(BeNumerically(">=", 2), "Requires at least 2 nodes")
 
-		host0Name = nodes.Items[0].ObjectMeta.Name
-		host1Name = nodes.Items[1].ObjectMeta.Name
+		host0Name = types.NodeName(nodes.Items[0].ObjectMeta.Name)
+		host1Name = types.NodeName(nodes.Items[1].ObjectMeta.Name)
 
 		mathrand.Seed(time.Now().UTC().UnixNano())
 	})
@@ -91,7 +92,7 @@ var _ = framework.KubeDescribe("Pod Disks", func() {
 			By("cleaning up PD-RW test environment")
 			podClient.Delete(host0Pod.Name, api.NewDeleteOptions(0))
 			podClient.Delete(host1Pod.Name, api.NewDeleteOptions(0))
-			detachAndDeletePDs(diskName, []string{host0Name, host1Name})
+			detachAndDeletePDs(diskName, []types.NodeName{host0Name, host1Name})
 		}()
 
 		By("submitting host0Pod to kubernetes")
@@ -155,7 +156,7 @@ var _ = framework.KubeDescribe("Pod Disks", func() {
 			By("cleaning up PD-RW test environment")
 			podClient.Delete(host0Pod.Name, &api.DeleteOptions{})
 			podClient.Delete(host1Pod.Name, &api.DeleteOptions{})
-			detachAndDeletePDs(diskName, []string{host0Name, host1Name})
+			detachAndDeletePDs(diskName, []types.NodeName{host0Name, host1Name})
 		}()
 
 		By("submitting host0Pod to kubernetes")
@@ -220,7 +221,7 @@ var _ = framework.KubeDescribe("Pod Disks", func() {
 			podClient.Delete(rwPod.Name, api.NewDeleteOptions(0))
 			podClient.Delete(host0ROPod.Name, api.NewDeleteOptions(0))
 			podClient.Delete(host1ROPod.Name, api.NewDeleteOptions(0))
-			detachAndDeletePDs(diskName, []string{host0Name, host1Name})
+			detachAndDeletePDs(diskName, []types.NodeName{host0Name, host1Name})
 		}()
 
 		By("submitting rwPod to ensure PD is formatted")
@@ -272,7 +273,7 @@ var _ = framework.KubeDescribe("Pod Disks", func() {
 			podClient.Delete(rwPod.Name, &api.DeleteOptions{})
 			podClient.Delete(host0ROPod.Name, &api.DeleteOptions{})
 			podClient.Delete(host1ROPod.Name, &api.DeleteOptions{})
-			detachAndDeletePDs(diskName, []string{host0Name, host1Name})
+			detachAndDeletePDs(diskName, []types.NodeName{host0Name, host1Name})
 		}()
 
 		By("submitting rwPod to ensure PD is formatted")
@@ -322,7 +323,7 @@ var _ = framework.KubeDescribe("Pod Disks", func() {
 			if host0Pod != nil {
 				podClient.Delete(host0Pod.Name, api.NewDeleteOptions(0))
 			}
-			detachAndDeletePDs(diskName, []string{host0Name})
+			detachAndDeletePDs(diskName, []types.NodeName{host0Name})
 		}()
 
 		fileAndContentToVerify := make(map[string]string)
@@ -377,8 +378,8 @@ var _ = framework.KubeDescribe("Pod Disks", func() {
 			if host0Pod != nil {
 				podClient.Delete(host0Pod.Name, api.NewDeleteOptions(0))
 			}
-			detachAndDeletePDs(disk1Name, []string{host0Name})
-			detachAndDeletePDs(disk2Name, []string{host0Name})
+			detachAndDeletePDs(disk1Name, []types.NodeName{host0Name})
+			detachAndDeletePDs(disk2Name, []types.NodeName{host0Name})
 		}()
 
 		containerName := "mycontainer"
@@ -535,16 +536,14 @@ func deletePD(pdName string) error {
 	}
 }
 
-func detachPD(hostName, pdName string) error {
+func detachPD(nodeName types.NodeName, pdName string) error {
 	if framework.TestContext.Provider == "gce" || framework.TestContext.Provider == "gke" {
-		instanceName := strings.Split(hostName, ".")[0]
-
 		gceCloud, err := getGCECloud()
 		if err != nil {
 			return err
 		}
 
-		err = gceCloud.DetachDisk(pdName, instanceName)
+		err = gceCloud.DetachDisk(pdName, nodeName)
 		if err != nil {
 			if gerr, ok := err.(*googleapi.Error); ok && strings.Contains(gerr.Message, "Invalid value for field 'disk'") {
 				// PD already detached, ignore error.
@@ -575,7 +574,7 @@ func detachPD(hostName, pdName string) error {
 	}
 }
 
-func testPDPod(diskNames []string, targetHost string, readOnly bool, numContainers int) *api.Pod {
+func testPDPod(diskNames []string, targetNode types.NodeName, readOnly bool, numContainers int) *api.Pod {
 	containers := make([]api.Container, numContainers)
 	for i := range containers {
 		containers[i].Name = "mycontainer"
@@ -608,7 +607,7 @@ func testPDPod(diskNames []string, targetHost string, readOnly bool, numContaine
 		},
 		Spec: api.PodSpec{
 			Containers: containers,
-			NodeName:   targetHost,
+			NodeName:   string(targetNode),
 		},
 	}
 
@@ -644,31 +643,31 @@ func testPDPod(diskNames []string, targetHost string, readOnly bool, numContaine
 }
 
 // Waits for specified PD to to detach from specified hostName
-func waitForPDDetach(diskName, hostName string) error {
+func waitForPDDetach(diskName string, nodeName types.NodeName) error {
 	if framework.TestContext.Provider == "gce" || framework.TestContext.Provider == "gke" {
-		framework.Logf("Waiting for GCE PD %q to detach from node %q.", diskName, hostName)
+		framework.Logf("Waiting for GCE PD %q to detach from node %q.", diskName, nodeName)
 		gceCloud, err := getGCECloud()
 		if err != nil {
 			return err
 		}
 
 		for start := time.Now(); time.Since(start) < gcePDDetachTimeout; time.Sleep(gcePDDetachPollTime) {
-			diskAttached, err := gceCloud.DiskIsAttached(diskName, hostName)
+			diskAttached, err := gceCloud.DiskIsAttached(diskName, nodeName)
 			if err != nil {
-				framework.Logf("Error waiting for PD %q to detach from node %q. 'DiskIsAttached(...)' failed with %v", diskName, hostName, err)
+				framework.Logf("Error waiting for PD %q to detach from node %q. 'DiskIsAttached(...)' failed with %v", diskName, nodeName, err)
 				return err
 			}
 
 			if !diskAttached {
 				// Specified disk does not appear to be attached to specified node
-				framework.Logf("GCE PD %q appears to have successfully detached from %q.", diskName, hostName)
+				framework.Logf("GCE PD %q appears to have successfully detached from %q.", diskName, nodeName)
 				return nil
 			}
 
-			framework.Logf("Waiting for GCE PD %q to detach from %q.", diskName, hostName)
+			framework.Logf("Waiting for GCE PD %q to detach from %q.", diskName, nodeName)
 		}
 
-		return fmt.Errorf("Gave up waiting for GCE PD %q to detach from %q after %v", diskName, hostName, gcePDDetachTimeout)
+		return fmt.Errorf("Gave up waiting for GCE PD %q to detach from %q after %v", diskName, nodeName, gcePDDetachTimeout)
 	}
 
 	return nil
@@ -684,7 +683,7 @@ func getGCECloud() (*gcecloud.GCECloud, error) {
 	return gceCloud, nil
 }
 
-func detachAndDeletePDs(diskName string, hosts []string) {
+func detachAndDeletePDs(diskName string, hosts []types.NodeName) {
 	for _, host := range hosts {
 		framework.Logf("Detaching GCE PD %q from node %q.", diskName, host)
 		detachPD(host, diskName)
@@ -697,7 +696,8 @@ func detachAndDeletePDs(diskName string, hosts []string) {
 
 func waitForPDInVolumesInUse(
 	nodeClient client.NodeInterface,
-	diskName, nodeName string,
+	diskName string,
+	nodeName types.NodeName,
 	timeout time.Duration,
 	shouldExist bool) error {
 	logStr := "to contain"
@@ -708,7 +708,7 @@ func waitForPDInVolumesInUse(
 		"Waiting for node %s's VolumesInUse Status %s PD %q",
 		nodeName, logStr, diskName)
 	for start := time.Now(); time.Since(start) < timeout; time.Sleep(nodeStatusPollTime) {
-		nodeObj, err := nodeClient.Get(nodeName)
+		nodeObj, err := nodeClient.Get(string(nodeName))
 		if err != nil || nodeObj == nil {
 			framework.Logf(
 				"Failed to fetch node object %q from API server. err=%v",